diff --git a/README.md b/README.md
index 25acbcd33d3..d3768715c27 100644
--- a/README.md
+++ b/README.md
@@ -48,8 +48,8 @@ Follow the [Jekyll Docs](https://jekyllrb.com/docs/installation/) to complete th
 
 There are two ways to get the theme:
 
-  - Install from [RubyGems](https://rubygems.org/gems/jekyll-theme-chirpy)
-  - Fork from GitHub
+- Install from [RubyGems](https://rubygems.org/gems/jekyll-theme-chirpy)
+- Fork from GitHub
 
 ### Install From Rubygems
 
@@ -81,9 +81,6 @@ $ bundle info --path jekyll-theme-chirpy
 
 Or you can [use the starter template][use-starter] to create a Jekyll site to save time copying contents from theme's gem.
 
-[starter]: https://github.com/cotes2020/chirpy-starter
-[use-starter]: https://github.com/cotes2020/chirpy-starter/generate
-
 ### Fork From GitHub
 
 [Fork **Chirpy**](https://github.com/cotes2020/jekyll-theme-chirpy/fork) from GitHub and clone your fork to local.
@@ -104,16 +101,15 @@ $ bash tools/init.sh
 
 What it does is:
 
-  1. Remove some files or directories from your repository:
-
-      - `.travis.yml`
-      - files under `_posts`
-      - folder `docs`
+1. Remove some files or directories from your repository:
 
-  2. If you use the `--no-gh` option, the directory `.github` will be deleted. Otherwise, setup the GitHub Action workflow by removing extension `.hook` of `.github/workflows/pages-deploy.yml.hook`, and then remove the other files and directories in folder `.github`.
+    - `.travis.yml`
+    - files under `_posts`
+    - folder `docs`
 
-  3. Automatically create a commit to save the changes.
+2. If you use the `--no-gh` option, the directory `.github` will be deleted. Otherwise, setup the GitHub Action workflow by removing extension `.hook` of `.github/workflows/pages-deploy.yml.hook`, and then remove the other files and directories in folder `.github`.
 
+3. Automatically create a commit to save the changes.
 
 ## Usage
 
@@ -121,10 +117,10 @@ What it does is:
 
 Update the variables of `_config.yml` as needed. Some of them are typical options:
 
-  - `url`
-  - `avatar`
-  - `timezone`
-  - `theme_mode`
+- `url`
+- `avatar`
+- `timezone`
+- `theme_mode`
 
 ### Running Local Server
 
@@ -157,23 +153,20 @@ For security reasons, GitHub Pages build runs on `safe` mode, which restricts us
 
 Quickly check the files needed for GitHub Actions build:
 
-  1. Ensure your Jekyll site has the file `/.github/workflows/pages-deploy.yml`. Otherwise, create a new one and fill in the contents of the [workflow file][workflow], and the value of the `on.push.branches` should be the same as your repo's default branch name.
-
-  2. Ensuer your Jekyll site has file `/tools/test.sh` and `/tools/deploy.sh`. Otherwise, copy them from this repo to your Jekyll site.
-
-[workflow]:https://github.com/cotes2020/jekyll-theme-chirpy/blob/master/.github/workflows/pages-deploy.yml.hook
+1. Ensure your Jekyll site has the file `/.github/workflows/pages-deploy.yml`. Otherwise, create a new one and fill in the contents of the [workflow file][workflow], and the value of the `on.push.branches` should be the same as your repo's default branch name.
+2. Ensuer your Jekyll site has file `/tools/test.sh` and `/tools/deploy.sh`. Otherwise, copy them from this repo to your Jekyll site.
 
 Next, rename your repoistory to `<GH-USERNAME>.github.io` on GitHub.
 
 And then publish your Jekyll site by:
 
-  1. Push any commit to remote to trigger the GitHub Actions workflow. Once the build is complete and successful, a new remote branch named `gh-pages` will appear to store the built site files.
+1. Push any commit to remote to trigger the GitHub Actions workflow. Once the build is complete and successful, a new remote branch named `gh-pages` will appear to store the built site files.
 
-  2. Browse to your repo's landing page on GitHub and select the branch `gh-pages` as the [publishing source](https://docs.github.com/en/github/working-with-github-pages/configuring-a-publishing-source-for-your-github-pages-site) throught _Settings_ → _Options_ → _GitHub Pages_:
+2. Browse to your repo's landing page on GitHub and select the branch `gh-pages` as the [publishing source](https://docs.github.com/en/github/working-with-github-pages/configuring-a-publishing-source-for-your-github-pages-site) throught _Settings_ → _Options_ → _GitHub Pages_:
 
-      ![gh-pages-sources](https://cdn.jsdelivr.net/gh/cotes2020/chirpy-images/posts/20190809/gh-pages-sources.png)
+    ![gh-pages-sources](https://cdn.jsdelivr.net/gh/cotes2020/chirpy-images/posts/20190809/gh-pages-sources.png)
 
-  3. Visit your website at the address indicated by GitHub.
+3. Visit your website at the address indicated by GitHub.
 
 #### Deploy on Other Platforms
 
@@ -197,7 +190,6 @@ $ docker run -it --rm \
 
 Unless you specified the output path, the generated site files will be placed in folder `_site` of the project's root directory. Now you should upload those files to your web server.
 
-
 ## Documentation
 
 For more details and the better reading experience, please check out the [tutorials on demo site](https://chirpy.cotes.info/categories/tutorial/). In the meanwhile, a copy of the tutorial is also available on the [Wiki](https://github.com/cotes2020/jekyll-theme-chirpy/wiki).
@@ -212,11 +204,9 @@ This theme is mainly built with [Jekyll](https://jekyllrb.com/) ecosystem, [Boot
 
 :tada: Thanks to all the volunteers who contributed to this project, their GitHub IDs are on [this list](https://github.com/cotes2020/jekyll-theme-chirpy/graphs/contributors). Also, I won't forget those guys who submitted the issues or unmerged PR because they reported bugs, shared ideas or inspired me to write more readable documentation.
 
-Also, thank [JetBrains][JB] for providing the open source license.
-
-[![JB-logo](https://cdn.jsdelivr.net/gh/cotes2020/chirpy-images/commons/jetbrains.svg)][JB]
+Also, thank [JetBrains][jb] for providing the open source license.
 
-[JB]:https://www.jetbrains.com/?from=jekyll-theme-chirpy
+[![JB-logo](https://cdn.jsdelivr.net/gh/cotes2020/chirpy-images/commons/jetbrains.svg)][jb]
 
 ## Supporting
 
@@ -225,3 +215,8 @@ If you enjoy this theme or find it helpful, please consider becoming my sponsor,
 ## License
 
 This work is published under [MIT](https://github.com/cotes2020/jekyll-theme-chirpy/blob/master/LICENSE) License.
+
+[starter]: https://github.com/cotes2020/chirpy-starter
+[use-starter]: https://github.com/cotes2020/chirpy-starter/generate
+[workflow]:https://github.com/cotes2020/jekyll-theme-chirpy/blob/master/.github/workflows/pages-deploy.yml.hook
+[jb]:https://www.jetbrains.com/?from=jekyll-theme-chirpy
diff --git a/_posts/2019-08-09-getting-started.md b/_posts/2019-08-09-getting-started.md
index 1cd904f8771..e36bd3ff1f8 100644
--- a/_posts/2019-08-09-getting-started.md
+++ b/_posts/2019-08-09-getting-started.md
@@ -15,8 +15,8 @@ Follow the [Jekyll Docs](https://jekyllrb.com/docs/installation/) to complete th
 
 There are two ways to get the theme:
 
-  - Install from [RubyGems](https://rubygems.org/gems/jekyll-theme-chirpy)
-  - Fork from GitHub
+- Install from [RubyGems](https://rubygems.org/gems/jekyll-theme-chirpy)
+- Fork from GitHub
 
 ### Install From Rubygems
 
@@ -48,9 +48,6 @@ $ bundle info --path jekyll-theme-chirpy
 
 Or you can [use the starter template][use-starter] to create a Jekyll site to save time copying contents from theme's gem.
 
-[starter]: https://github.com/cotes2020/chirpy-starter
-[use-starter]: https://github.com/cotes2020/chirpy-starter/generate
-
 ### Fork From GitHub
 
 [Fork **Chirpy**](https://github.com/cotes2020/jekyll-theme-chirpy/fork) from GitHub and clone your fork to local.
@@ -71,15 +68,15 @@ $ bash tools/init.sh
 
 What it does is:
 
-  1. Remove some files or directories from your repository:
+1. Remove some files or directories from your repository:
 
-      - `.travis.yml`
-      - files under `_posts`
-      - folder `docs`
+    - `.travis.yml`
+    - files under `_posts`
+    - folder `docs`
 
-  2. If you use the `--no-gh` option, the directory `.github` will be deleted. Otherwise, setup the GitHub Action workflow by removing extension `.hook` of `.github/workflows/pages-deploy.yml.hook`, and then remove the other files and directories in folder `.github`.
+2. If you use the `--no-gh` option, the directory `.github` will be deleted. Otherwise, setup the GitHub Action workflow by removing extension `.hook` of `.github/workflows/pages-deploy.yml.hook`, and then remove the other files and directories in folder `.github`.
 
-  3. Automatically create a commit to save the changes.
+3. Automatically create a commit to save the changes.
 
 
 ## Usage
@@ -88,10 +85,10 @@ What it does is:
 
 Update the variables of `_config.yml` as needed. Some of them are typical options:
 
-  - `url`
-  - `avatar`
-  - `timezone`
-  - `theme_mode`
+- `url`
+- `avatar`
+- `timezone`
+- `theme_mode`
 
 ### Running Local Server
 
@@ -124,23 +121,20 @@ For security reasons, GitHub Pages build runs on `safe` mode, which restricts us
 
 Quickly check the files needed for GitHub Actions build:
 
-  1. Ensure your Jekyll site has the file `/.github/workflows/pages-deploy.yml`. Otherwise, create a new one and fill in the contents of the [workflow file][workflow], and the value of the `on.push.branches` should be the same as your repo's default branch name.
-
-  2. Ensuer your Jekyll site has file `/tools/test.sh` and `/tools/deploy.sh`. Otherwise, copy them from this repo to your Jekyll site.
-
-[workflow]:https://github.com/cotes2020/jekyll-theme-chirpy/blob/master/.github/workflows/pages-deploy.yml.hook
+1. Ensure your Jekyll site has the file `/.github/workflows/pages-deploy.yml`. Otherwise, create a new one and fill in the contents of the [workflow file][workflow], and the value of the `on.push.branches` should be the same as your repo's default branch name.
+2. Ensuer your Jekyll site has file `/tools/test.sh` and `/tools/deploy.sh`. Otherwise, copy them from this repo to your Jekyll site.
 
 Next, rename your repoistory to `<GH-USERNAME>.github.io` on GitHub.
 
 And then publish your Jekyll site by:
 
-  1. Push any commit to remote to trigger the GitHub Actions workflow. Once the build is complete and successful, a new remote branch named `gh-pages` will appear to store the built site files.
+1. Push any commit to remote to trigger the GitHub Actions workflow. Once the build is complete and successful, a new remote branch named `gh-pages` will appear to store the built site files.
 
-  2. Browse to your repo's landing page on GitHub and select the branch `gh-pages` as the [publishing source](https://docs.github.com/en/github/working-with-github-pages/configuring-a-publishing-source-for-your-github-pages-site) throught _Settings_ → _Options_ → _GitHub Pages_:
+2. Browse to your repo's landing page on GitHub and select the branch `gh-pages` as the [publishing source](https://docs.github.com/en/github/working-with-github-pages/configuring-a-publishing-source-for-your-github-pages-site) throught _Settings_ → _Options_ → _GitHub Pages_:
 
-      ![gh-pages-sources](https://cdn.jsdelivr.net/gh/cotes2020/chirpy-images/posts/20190809/gh-pages-sources.png)
+    ![gh-pages-sources](https://cdn.jsdelivr.net/gh/cotes2020/chirpy-images/posts/20190809/gh-pages-sources.png)
 
-  3. Visit your website at the address indicated by GitHub.
+3. Visit your website at the address indicated by GitHub.
 
 #### Deploy on Other Platforms
 
diff --git a/_posts/2021-01-03-enable-google-pv.md b/_posts/2021-01-03-enable-google-pv.md
index 0089ca54d02..4bbdf810354 100644
--- a/_posts/2021-01-03-enable-google-pv.md
+++ b/_posts/2021-01-03-enable-google-pv.md
@@ -16,10 +16,10 @@ This post is to enable Page Views on the [**Chirpy**][chirpy-homepage] theme bas
 First, you need to setup your account on Google analytics. While your create your account, you must create your first **Property** as well.
 
 1. Head to <https://analytics.google.com/> and click on **Start Measuring**
-2. Enter your desired *Account Name* and choose the desired checkboxes
-3. Enter your desired *Property Name*. This is the name of the tracker project that appears on your Google Analytics dashboard
-4. Enter the required information *About your business*
-5. Hit *Create* and accept any license popup to setup your Google Analytics account and create your property
+2. Enter your desired _Account Name_ and choose the desired checkboxes
+3. Enter your desired _Property Name_. This is the name of the tracker project that appears on your Google Analytics dashboard
+4. Enter the required information _About your business_
+5. Hit _Create_ and accept any license popup to setup your Google Analytics account and create your property
 
 ### Create Data Stream
 
@@ -75,9 +75,9 @@ There is a detailed [tutorial](https://developers.google.com/analytics/solutions
 
 8. Click on **Enable APIs and Services** button on the top
 
-9. Enable the following APIs: *Google Analytics API*
+9. Enable the following APIs: _Google Analytics API_
 
-10. On the left, Click on *OAuth Consent Screen* and accept **Configure Consent Screen**. Select **External** since your blog is probably hosted for the public. Click on **Publish** under *Publishing Status*
+10. On the left, Click on _OAuth Consent Screen_ and accept **Configure Consent Screen**. Select **External** since your blog is probably hosted for the public. Click on **Publish** under _Publishing Status_
 
 11. Click on **Credentials** on the left and create a new **OAuth Client IDs** credential. Make sure to add a entry under `Authorized redirect URIs` that matches: `https://<project-id>.<region>.r.appspot.com/admin/auth`
 
@@ -116,10 +116,11 @@ There is a detailed [tutorial](https://developers.google.com/analytics/solutions
 1. Clone the **Google Analytics superProxy** project on Github: <https://github.com/googleanalytics/google-analytics-super-proxy> to your local.
 
 2. Remove the first 2 lines in the [`src/app.yaml`](https://github.com/googleanalytics/google-analytics-super-proxy/blob/master/src/app.yaml#L1-L2) file:
-	```diff
-- application: your-project-id
-- version: 1
-	```
+
+    ```yaml
+    -application: your-project-id
+    -version: 1
+    ```
 
 3. In `src/config.py`, add the `OAUTH_CLIENT_ID` and `OAUTH_CLIENT_SECRET` that you gathered from you App Engine Dashboard.
 
@@ -143,7 +144,8 @@ There is a detailed [tutorial](https://developers.google.com/analytics/solutions
     # XSRF Settings
     XSRF_KEY = 'OnceUponATimeThereLivedALegend'
     ```
-**Tip:** You can configure a custom domain instead of `https://PROJECT_ID.REGION_ID.r.appspot.com`. But, for the sake of keeping it simple, we will be using the Google provided default URL.
+
+    **Tip:** You can configure a custom domain instead of `https://PROJECT_ID.REGION_ID.r.appspot.com`. But, for the sake of keeping it simple, we will be using the Google provided default URL.
 
 5. From inside the src/ directory, deploy the app
 
@@ -194,20 +196,17 @@ Head to `https://PROJECT_ID.REGION_ID.r.appspot.com/admin` and create a query af
 The query parameters are as follows:
 
 - **start-date**: fill in the first day of blog posting
-
 - **end-date**: fill in `today` (this is a parameter supported by GA Report, which means that it will always end according to the current query date)
-
 - **metrics**: select `ga:pageviews`
-
 - **dimensions**: select `ga:pagePath`
 
 In order to reduce the returned results and reduce the network bandwidth, we add custom filtering rules [^ga-filters]:
 
-- **filters**: fill in `ga:pagePath=~^/posts/.*/$;ga:pagePath!@=`
+- **filters**: fill in `ga:pagePath=~^/posts/.*/$;ga:pagePath!@=`.
 
-  Among them, `;` means using _logical AND_ to concatenate two rules.
+    Among them, `;` means using _logical AND_ to concatenate two rules.
 
-  If the `site.baseurl` is specified, change the first filtering rule to `ga:pagePath=~^/BASE_URL/posts/.*/$`, where `BASE_URL` is the value of `site.baseurl`.
+    If the `site.baseurl` is specified, change the first filtering rule to `ga:pagePath=~^/BASE_URL/posts/.*/$`, where `BASE_URL` is the value of `site.baseurl`.
 
 After <kbd>Run Query</kbd>, copy the generated contents of **API Query URI** at the bottom of the page, and fill in the **Encoded URI for the query** of SuperProxy on GAE.
 
@@ -224,6 +223,7 @@ Once all the hard part is done, it is very easy to enable the Page View on Chirp
 
 Update the `_config.yml` file of [**Chirpy**][chirpy-homepage] project with the values from your dashboard, to look similar to the following:
 
+
 ```yaml
 google_analytics:
   id: 'G-XXXXXXXXXX'   # Fill with your Google Analytics ID
diff --git a/_sass/addon/commons.scss b/_sass/addon/commons.scss
index bc847f2d23f..7fc51b5f9a9 100644
--- a/_sass/addon/commons.scss
+++ b/_sass/addon/commons.scss
@@ -6,18 +6,23 @@
 @mixin mode-toggle($dark-mode: false) {
   @if $dark-mode {
     @include dark-scheme;
+
     .mode-toggle {
       transform: rotateY(180deg);
     }
+
   } @else {
     @include light-scheme;
+
     .mode-toggle {
       transform: none;
     }
   }
+
 }
 
-html:not([mode]), html[mode=light] {
+html:not([mode]),
+html[mode=light] {
   @include mode-toggle();
 }
 
@@ -26,7 +31,8 @@ html[mode=dark] {
 }
 
 @media (prefers-color-scheme: dark) {
-  html:not([mode]), html[mode=dark] {
+  html:not([mode]),
+  html[mode=dark] {
     @include mode-toggle(true);
   }
 
@@ -47,484 +53,124 @@ body {
   font-family: 'Source Sans Pro', 'Microsoft Yahei', sans-serif;
 }
 
-/*--- sidebar layout ---*/
-
-$tab-count: 5 !default;
-
-$sidebar-display: "sidebar-display";
-
-#sidebar {
-  @include pl-pr(0);
-  position: fixed;
-  top: 0;
-  left: 0;
-  height: 100%;
-  overflow-y: auto;
-  width: $sidebar-width-medium;
-  z-index: 99;
-  background: var(--sidebar-bg);
-
-  a {
-    @include sidebar-links;
-    &:hover {
-      color: #fff;
-      @include no-text-decoration;
-    }
-  }
-
-  .site-title {
-    a {
-      font-weight: 900;
-      font-size: 1.5rem;
-      letter-spacing: 0.5px;
-    }
-  }
+/* --- Typography --- */
 
-  .site-subtitle {
-    font-size: 95%;
-    color: #828282;
-    line-height: 1.2rem;
-    word-spacing: 1px;
-    margin: 0.5rem 1.5rem 0.5rem 1.5rem;
-    min-height: 3rem; // avoid vertical shifting in multi-line words
-    user-select: none;
-  }
+h1 {
+  @extend %heading;
 
-  .nav-link {
-    border-radius: 0;
-    font-size: 0.95rem;
-    font-weight: 600;
-    letter-spacing: 1px;
-    display: table-cell;
-    vertical-align: middle;
-  }
+  font-size: 1.8rem;
+}
 
-  .nav-item {
-    text-align: center;
-    display: table;
-    height: $tab-height;
-    &:hover {
-      .nav-link {
-        color: #f8f9facf;
-      }
-    }
-    &.active {
-      .nav-link {
-        color: #fcfcfc;
-      }
-    }
-  }
+h2 {
+  @extend %heading;
+  @extend %section;
+  @extend %anchor;
 
-  ul {
-    height: $tab-height * $tab-count;
-    margin-bottom: 2rem;
-    padding-left: 0;
+  font-size: 1.4rem;
+}
 
-    > li {
-      width: 100%;
+h3 {
+  @extend %heading;
+  @extend %section;
+  @extend %anchor;
 
-      &:last-child {
-        $cursor-width: 3px;
+  font-size: 1.25rem;
+}
 
-        > a {
-          position: relative;
-          left: $cursor-width / 2;
-          width: 100%;
-        }
+h4 {
+  @extend %heading;
+  @extend %section;
+  @extend %anchor;
 
-        &::after { // the cursor
-          display: table;
-          visibility: hidden;
-          content: "";
-          position: relative;
-          right: 1px;
-          width: $cursor-width;
-          height: $tab-cursor-height;
-          border-radius: 1px;
-          background-color: var(--nav-cursor-color);
-          pointer-events: none;
-        }
-      }
-    } // li
+  font-size: 1.15rem;
+}
 
-    @mixin fix-cursor($top) {
-      top: $top;
-      visibility: visible;
-    }
+h5 {
+  @extend %heading;
+  @extend %section;
+  @extend %anchor;
 
-    @for $i from 1 through $tab-count {
-      $offset: $tab-count - $i;
-      $top: -$offset * $tab-height + $tab-cursor-height / 2;
+  font-size: 1.1rem;
+}
 
-      @if $i < $tab-count {
-        > li.active:nth-child(#{$i}),
-        > li.nav-item:nth-child(#{$i}):hover {
-          ~li:last-child::after {
-            @include fix-cursor($top);
-          }
-        }
-      } @else {
-        > li.active:nth-child(#{$i}):last-child::after,
-        > li.nav-item:nth-child(#{$i}):last-child:hover::after {
-          @include fix-cursor($top);
-        }
-      }
+ol,
+ul {
+  ol,
+  ul {
+    margin-bottom: 1rem;
+  }
+}
 
-    } // @for
+a {
+  @extend %link-color;
+}
 
-  } // ul
+img {
+  max-width: 100%;
+}
 
-  .sidebar-bottom {
-    font-size: 1.2rem;
-    margin-bottom: 2.1rem;
+blockquote {
+  border-left: 5px solid var(--blockquote-border-color);
+  padding-left: 1rem;
+  color: var(--blockquote-text-color);
+}
 
-    @include ml-mr(auto);
-    @include pl-pr(1rem);
+kbd {
+  margin: 0 0.3rem;
+}
 
-    %icon {
-      width: 2.4rem;
-      text-align: center;
-    }
+footer {
+  position: absolute;
+  bottom: 0;
+  padding: 0 1rem;
+  height: $footer-height;
+  font-size: 0.8rem;
+  color: #7a7b7d;
+  background-color: var(--footer-bg-color);
 
-    a {
-      @extend %icon;
-    }
+  > div.d-flex {
+    line-height: 1.2rem;
+    width: 95%;
+    max-width: 1045px;
+    border-top: 1px solid var(--main-border-color);
+    margin-bottom: 1rem;
 
-    a:hover, #mode-toggle-wrapper > i:hover {
-      color: #fff;
+    > div {
+      width: 350px;
     }
+  }
 
-    #mode-toggle-wrapper {
-      @extend %icon;
-
-      i {
-        @include sidebar-links;
-        margin: 0;
-        font-size: 1.05rem;
-        text-align: center;
-        position: relative;
-        bottom: 1px;
-      }
-
+  a {
+    color: var(--footer-link);
+    &:link {
+      @include no-text-decoration;
     }
+    &:hover {
+      @extend %link-hover;
 
-    .icon-border {
-      background-color: #525354;
-      content: "";
-      width: 3px;
-      height: 3px;
-      border-radius: 50%;
-      position: relative;
-      top: 12px;
+      @include no-text-decoration;
     }
-
-  } // .sidebar-bottom
-
-} // #sidebar
-
-@media (hover: hover) {
-  #sidebar ul > li:last-child::after {
-    -webkit-transition: top 0.5s ease;
-    -moz-transition: top 0.5s ease;
-    -o-transition: top 0.5s ease;
-    transition: top 0.5s ease;
+  }
+  .footer-right {
+    text-align: right;
   }
 }
 
-.profile-wrapper {
-  margin-top: 2rem;
-  width: 100%;
-}
+/* --- Panels --- */
 
-#avatar {
-  > a {
-    display: block;
-    width: 6rem;
-    height: 6rem;
-    border-radius: 50%;
-    border: 2px solid #b6b6b6;
-    overflow: hidden;
-    transform: translateZ(0); // fixed the zoom in Safari
-    -webkit-transition: border-color 0.35s ease-in-out;
-    -moz-transition: border-color 0.35s ease-in-out;
-    transition: border-color 0.35s ease-in-out;
-  }
+.access {
+  top: 2rem;
+  transition: top 0.2s ease-in-out;
+  margin-right: 1.5rem;
+  margin-top: 3rem;
+  margin-bottom: 4rem;
 
-  &:hover > a {
-    border-color: #fff;
+  &:only-child {
+    position: -webkit-sticky; /* Safari */
+    position: sticky;
   }
-
-  img {
-    width: 100%;
-    height: 100%;
-    -webkit-transition: transform 0.5s;
-    -moz-transition: transform 0.5s;
-    transition: transform 0.5s;
-
-    &:hover {
-      -ms-transform: scale(1.2);
-      -moz-transform: scale(1.2);
-      -webkit-transform: scale(1.2);
-      transform: scale(1.2);
-    }
-  }
-} // #avatar
-
-#search-result-wrapper {
-  display: none;
-  position: fixed;
-  top: 0;
-  padding-top: 3rem;
-  height: 100%;
-  overflow: auto;
-  .post-content {
-    margin-top: 2rem;
-  }
-}
-
-/*--- top-bar ---*/
-
-#topbar-wrapper {
-  height: $topbar-height;
-  position: fixed;
-  top: 0;
-  left: 260px; /* same as sidebar width */
-  right: 0;
-  transition: top 0.2s ease-in-out;
-  z-index: 50;
-  border-bottom: 1px solid rgba(0, 0, 0, 0.07);
-  box-shadow: 0 3px 5px 0 rgba(0, 0, 0, 0.05);
-  background-color: var(--topbar-wrapper-bg);
-}
-
-#topbar i { // icons
-  color: #999;
-}
-
-#breadcrumb {
-  font-size: 1rem;
-  color: gray;
-  padding-left: 0.5rem;
-  a:hover {
-    @extend %link-hover;
-  }
-  span {
-    &:not(:last-child) {
-      &::after {
-        content: "›";
-        padding: 0 0.3rem;
-      }
-    }
-  }
-}
-
-#sidebar-trigger,
-#search-trigger {
-  display: none;
-}
-
-#search-wrapper {
-  display: flex;
-  width: 95%;
-  border-radius: 1rem;
-  border: 1px solid var(--search-wrapper-bg);
-  background: var(--search-wrapper-bg);
-  padding: 0 0.5rem;
-  i {
-    z-index: 2;
-    font-size: 0.9rem;
-    color: var(--search-icon-color);
-  }
-  .fa-times-circle { /* button 'clean up' */
-    visibility: hidden;
-  }
-}
-
-#search-cancel { /* 'Cancel' link */
-  color: var(--link-color);
-  margin-left: 1rem;
-  display: none;
-}
-
-#search-input {
-  background: center;
-  border: 0;
-  border-radius: 0;
-  padding: 0.18rem 0.3rem;
-  color: var(--text-color);
-  font-size: 95%;
-}
-
-#search-input {
-  &:focus {
-    box-shadow: none;
-    background: center;
-    &.form-control {
-      &::-webkit-input-placeholder { @include input-placeholder }
-      &::-moz-placeholder { @include input-placeholder }
-      &:-ms-input-placeholder { @include input-placeholder }
-      &::placeholder { @include input-placeholder }
-    }
-  }
-}
-
-#search-hints {
-  display: none;
-  .post-tag {
-    display: inline-block;
-    line-height: 1rem;
-    font-size: 1rem;
-    background: var(--search-tag-bg);
-    border: none;
-    padding: 0.5rem;
-    margin: 0 1rem 1rem 0;
-    &::before {
-      content: "#";
-      color: var(--text-muted-color);
-      padding-right: 0.2rem;
-    }
-  }
-}
-
-#search-results {
-  padding-bottom: 6rem;
-  a {
-    @extend %link-color;
-    @extend %no-bottom-border;
-    @extend %heading;
-    font-size: 1.4rem;
-    line-height: 2.5rem;
-    &:hover {
-      @extend %link-hover;
-    }
-  }
-  > div {
-    max-width: 100%;
-    &:not(:last-child) {
-      margin-bottom: 1rem;
-    }
-    i { // icons
-      color: #818182;
-      margin-right: 0.15rem;
-      font-size: 80%;
-    }
-    > p {
-      overflow: hidden;
-      text-overflow: ellipsis;
-      display: -webkit-box;
-      -webkit-line-clamp: 3;
-      -webkit-box-orient: vertical;
-    }
-  }
-}
-
-#topbar-title {
-  display: none;
-  font-size: 1.1rem;
-  font-weight: 600;
-  font-family: sans-serif;
-  color: var(--topbar-text-color);
-  text-align: center;
-  width: 70%;
-  overflow: hidden;
-  text-overflow: ellipsis;
-  word-break: keep-all;
-  white-space: nowrap;
-}
-
-#mask {
-  display: none;
-  position: fixed;
-  top: 0;
-  right: 0;
-  bottom: 0;
-  left: 0;
-  height: 100%;
-  width: 100%;
-  z-index: 1;
-  @at-root [#{$sidebar-display}] & {
-    display: block!important;
-  }
-}
-
-/*--- main wrapper ---*/
-
-#main-wrapper {
-  background-color: var(--main-wrapper-bg);
-  position: relative;
-  min-height: 100vh;
-  padding-bottom: $footer-height;
-  @include pl-pr(0);
-}
-
-#main > div.row:first-child > div {
-  &:nth-child(1), &:nth-child(2) {
-    margin-top: $topbar-height; /* same as the height of topbar */
-  }
-  &:first-child {
-    /* 3rem for topbar, 6rem for footer */
-    min-height: calc(100vh - #{$topbar-height} - #{$footer-height} - #{$post-extend-min-height});
-  }
-}
-
-#post-wrapper {
-  min-height: calc(100vh - #{$topbar-height}
-    - #{$footer-height} - #{$post-extend-min-height})!important;
-}
-
-#topbar-wrapper.row,
-#main>.row,
-#search-result-wrapper>.row {
-  @include ml-mr(0);
-}
-
-footer {
-  position: absolute;
-  bottom: 0;
-  padding: 0 1rem;
-  height: $footer-height;
-  font-size: 0.8rem;
-  color: #7a7b7d;
-  background-color: var(--footer-bg-color);
-  > div.d-flex {
-    line-height: 1.2rem;
-    width: 95%;
-    max-width: 1045px;
-    border-top: 1px solid var(--main-border-color);
-    margin-bottom: 1rem;
-    > div {
-      width: 350px;
-    }
-  }
-  a {
-    color: var(--footer-link);
-    &:link {
-      @include no-text-decoration;
-    }
-    &:hover {
-      @extend  %link-hover;
-      @include no-text-decoration;
-    }
-  }
-  .footer-right {
-    text-align: right;
-  }
-}
-
-/*--- Panels ---*/
-
-.access {
-  top: 2rem;
-  transition: top 0.2s ease-in-out;
-  margin-right: 1.5rem;
-  margin-top: 3rem;
-  margin-bottom: 4rem;
-  &:only-child {
-    position: -webkit-sticky; /* Safari */
-    position: sticky;
-  }
-  &.topbar-down {
-    top: 6rem;
+  &.topbar-down {
+    top: 6rem;
   }
   > div {
     padding-left: 1rem;
@@ -541,11 +187,11 @@ footer {
   }
 }
 
-
 #access-tags {
   > div.post-content > div {
     max-width: 80%;
   }
+
   .post-tag {
     display: inline-block;
     line-height: 1rem;
@@ -565,106 +211,28 @@ footer {
 }
 
 #access-lastmod {
-  ul {
-    > li {
-      height: 1.8rem;
-      overflow: hidden;
-      text-overflow: ellipsis;
-      display: -webkit-box;
-      -webkit-line-clamp: 1;
-      -webkit-box-orient: vertical;
-      list-style: none;
-    }
-    a {
-      color: #6c757d;
-    }
+
+  li {
+    height: 1.8rem;
+    overflow: hidden;
+    text-overflow: ellipsis;
+    display: -webkit-box;
+    -webkit-line-clamp: 1;
+    -webkit-box-orient: vertical;
+    list-style: none;
   }
 
   a {
-    @extend %no-bottom-border;
     &:hover {
       @extend %link-hover;
     }
+
+    @extend %no-bottom-border;
+
+    color: #6c757d;
   }
-}
 
-/*--- button back-to-top ---*/
-
-#back-to-top {
-  display: none;
-  z-index: 1;
-  cursor: pointer;
-  position: fixed;
-  background: var(--button-bg);
-  color: var(--btn-backtotop-color);
-  height: 2.6em;
-  width: 2.7em;
-  border-radius: 50%;
-  border: 1px solid var(--btn-backtotop-border-color);
-  transition: 0.2s ease-out;
-  -webkit-transition: 0.2s ease-out;
-}
-
-#back-to-top:hover {
-  transform: translate3d(0, -5px, 0);
-  -webkit-transform: translate3d(0, -5px, 0);
-}
-
-/*--- Typography ---*/
-
-h1 {
-  @extend %heading;
-  font-size: 1.8rem;
-}
-
-h2 {
-  @extend %heading;
-  @extend %section;
-  @extend %anchor;
-  font-size: 1.4rem;
-}
-
-h3 {
-  @extend %heading;
-  @extend %section;
-  @extend %anchor;
-  font-size: 1.25rem;
-}
-
-h4 {
-  @extend %heading;
-  @extend %section;
-  @extend %anchor;
-  font-size: 1.15rem;
-}
-
-h5 {
-  @extend %heading;
-  @extend %section;
-  @extend %anchor;
-  font-size: 1.1rem;
-}
-
-ol, ul {
-  ol, ul {
-    margin-bottom: 1rem;
-  }
-}
-
-blockquote {
-  border-left: 5px solid var(--blockquote-border-color);
-  padding-left: 1rem;
-  color: var(--blockquote-text-color);
-  .post-content & {
-    a {
-      color: var(--link-color);
-    }
-  }
-}
-
-kbd {
-  margin: 0 0.3rem;
-}
+}
 
 .footnotes > ol {
   padding-left: 2rem;
@@ -678,11 +246,12 @@ kbd {
       margin-top: 0;
       margin-bottom: 0;
     }
-    &:target:not([scroll-focus]), &[scroll-focus=true] > p { // [scroll-focus] added by `smooth-scroll.js`
+    // [scroll-focus] added by `smooth-scroll.js`
+    &:target:not([scroll-focus]),
+    &[scroll-focus=true] > p {
       background-color: var(--footnote-target-bg);
       width: fit-content;
-      -webkit-transition: background-color 1.5s ease-in-out;
-      /* Safari prior 6.1 */
+      -webkit-transition: background-color 1.5s ease-in-out; // Safari prior 6.1
       transition: background-color 1.5s ease-in-out;
     }
   }
@@ -692,11 +261,15 @@ kbd {
   @at-root a#{&} {
     @include ml-mr(1px);
     @include pl-pr(2px);
+
     border-bottom-style: none !important;
-    -webkit-transition: background-color 1.5s ease-in-out; /* Safari prior 6.1 */
+    -webkit-transition: background-color 1.5s ease-in-out; // Safari prior 6.1
     transition: background-color 1.5s ease-in-out;
   }
-  @at-root sup:target:not([scroll-focus]), sup[scroll-focus=true] > a#{&} { // [scroll-focus] added by `smooth-scroll.js`
+
+  // [scroll-focus] added by `smooth-scroll.js`
+  @at-root sup:target:not([scroll-focus]),
+  sup[scroll-focus=true] > a#{&} {
     background-color: var(--footnote-target-bg);
   }
 }
@@ -712,34 +285,6 @@ kbd {
   }
 }
 
-a {
-  p > & {
-    @extend %link-color;
-  }
-  span > & {
-    @extend %link-color;
-  }
-  .post-preview & {
-    @extend %link-color;
-    &:hover {
-      @extend %link-hover;
-    }
-  }
-  .categories &,
-  #page-category &,
-  #tags &,
-  #archives & {
-    &:not(:hover) {
-      @extend %no-bottom-border;
-    }
-  }
-
-} // a
-
-img {
-  max-width: 100%;
-}
-
 .post {
   h1 {
     margin-top: 3rem;
@@ -755,8 +300,7 @@ img {
   }
 }
 
-
-/*--- Begin of Markdown table style ---*/
+/* --- Begin of Markdown table style --- */
 
 .table-wrapper { // it will be created by Liquid
   overflow-x: auto;
@@ -776,15 +320,13 @@ img {
 
     tbody {
       tr {
+        border-bottom: 1px solid var(--tb-border-color);
         &:nth-child(2n) {
           background-color: var(--tb-even-bg);
         }
         &:nth-child(2n + 1) {
           background-color: var(--tb-odd-bg);
         }
-        & {
-          border-bottom: 1px solid var(--tb-border-color);
-        }
         td {
           @extend %table-cell;
         }
@@ -793,8 +335,7 @@ img {
   }
 }
 
-
-/*--- post ---*/
+/* --- post --- */
 
 .pageviews .fa-spinner {
   font-size: 80%;
@@ -839,7 +380,6 @@ img {
   @mixin img($caption: false) {
 
     > img[data-src] {
-
       @if $caption {
         @include img-caption;
       }
@@ -858,6 +398,10 @@ img {
   }
 
   a {
+    blockquote & {
+      color: var(--link-color);
+    }
+
     &:not(.img-hyperlink) {
       @extend %link-color;
       @extend %link-underline;
@@ -865,172 +409,659 @@ img {
         @extend %link-hover;
       }
     }
+
     &.img-hyperlink {
       @include img;
       @include img-caption;
     }
   }
 
-  > p {
-    > img[data-src]:not(.normal):not(.left):not(.right) {
-      @include align-center;
+  > p {
+    > img[data-src]:not(.normal):not(.left):not(.right) {
+      @include align-center;
+    }
+  }
+
+  p {
+    @include img(true);
+
+    font-size: 1.08rem;
+  }
+
+  ul {
+    // attribute 'hide-bullet' was added by liquid
+    .task-list-item[hide-bullet] {
+      list-style-type: none;
+
+      > i { // checkbox icon
+        margin: 0 0.4rem 0.2rem -1.4rem;
+        vertical-align: middle;
+        color: var(--checkbox-color);
+        &.checked {
+          color: var(--checkbox-checked-color);
+        }
+      }
+
+    }
+
+    input[type=checkbox] {
+      margin: 0 0.5rem 0.2rem -1.3rem;
+      vertical-align: middle;
+    }
+
+  } // ul
+
+  > ol,
+  > ul {
+    padding-left: 2rem;
+
+    li {
+      + li {
+        margin-top: 0.3rem;
+      }
+
+      ol,
+      ul { // sub list
+        padding-left: 2rem;
+        margin-top: 0.3rem;
+      }
+    }
+
+  }
+
+  > ol {
+    li {
+      padding-left: 0.25em;
+    }
+  }
+
+  dl > dd {
+    margin-left: 1rem;
+  }
+
+} // .post-content
+
+.tag:hover {
+  @extend %tag-hover;
+}
+
+.post-tag {
+  display: inline-block;
+  min-width: 2rem;
+  text-align: center;
+  background: var(--tag-bg);
+  border-radius: 0.3rem;
+  padding: 0 0.4rem;
+  color: inherit;
+  line-height: 1.3rem;
+
+  &:not(:last-child) {
+    margin-right: 0.2rem;
+  }
+
+  &:hover {
+    @extend %tag-hover;
+
+    border-bottom: none;
+    text-decoration: none;
+    color: #d2603a;
+  }
+}
+
+/* --- buttons --- */
+.btn-lang {
+  border: 1px solid !important;
+  padding: 1px 3px;
+  border-radius: 3px;
+  color: var(--link-color);
+  &:focus {
+    box-shadow: none;
+  }
+}
+
+/* --- Effects classes --- */
+
+.loaded {
+  display: block !important;
+
+  @at-root .d-flex#{&} {
+    display: flex !important;
+  }
+}
+
+.unloaded {
+  display: none !important;
+}
+
+.visible {
+  visibility: visible !important;
+}
+
+.hidden {
+  visibility: hidden !important;
+}
+
+.flex-grow-1 {
+  -ms-flex-positive: 1 !important;
+  flex-grow: 1 !important;
+}
+
+.btn-box-shadow {
+  box-shadow: 0 0 8px 0 var(--btn-box-shadow) !important;
+}
+
+.topbar-up {
+  top: -3rem !important; /* same as topbar height. */
+}
+
+.no-text-decoration {
+  @include no-text-decoration;
+}
+
+.tooltip-inner { /* Overrided BS4 Tooltip */
+  font-size: 0.7rem;
+  max-width: 220px;
+  text-align: left;
+}
+
+.disabled {
+  color: rgb(206, 196, 196);
+  pointer-events: auto;
+  cursor: not-allowed;
+}
+
+.hide-border-bottom {
+  border-bottom: none !important;
+}
+
+.input-focus {
+  box-shadow: none;
+  border-color: var(--input-focus-border-color) !important;
+  background: center !important;
+  transition: background-color 0.15s ease-in-out, border-color 0.15s ease-in-out;
+}
+
+/* --- sidebar layout --- */
+
+$tab-count: 5 !default;
+
+$sidebar-display: "sidebar-display";
+
+#sidebar {
+  @include pl-pr(0);
+
+  position: fixed;
+  top: 0;
+  left: 0;
+  height: 100%;
+  overflow-y: auto;
+  width: $sidebar-width-medium;
+  z-index: 99;
+  background: var(--sidebar-bg);
+
+  a {
+    @include sidebar-links;
+
+    &:hover {
+      @include no-text-decoration;
+
+      color: #fff;
+    }
+  }
+
+  #avatar {
+    &:hover > a {
+      border-color: #fff;
+    }
+
+    > a {
+      display: block;
+      width: 6rem;
+      height: 6rem;
+      border-radius: 50%;
+      border: 2px solid #b6b6b6;
+      overflow: hidden;
+      transform: translateZ(0); // fixed the zoom in Safari
+      -webkit-transition: border-color 0.35s ease-in-out;
+      -moz-transition: border-color 0.35s ease-in-out;
+      transition: border-color 0.35s ease-in-out;
+    }
+
+    img {
+      width: 100%;
+      height: 100%;
+      -webkit-transition: transform 0.5s;
+      -moz-transition: transform 0.5s;
+      transition: transform 0.5s;
+
+      &:hover {
+        -ms-transform: scale(1.2);
+        -moz-transform: scale(1.2);
+        -webkit-transform: scale(1.2);
+        transform: scale(1.2);
+      }
+    }
+  } // #avatar
+
+  .site-title {
+    a {
+      font-weight: 900;
+      font-size: 1.5rem;
+      letter-spacing: 0.5px;
+    }
+  }
+
+  .site-subtitle {
+    font-size: 95%;
+    color: #828282;
+    line-height: 1.2rem;
+    word-spacing: 1px;
+    margin: 0.5rem 1.5rem 0.5rem 1.5rem;
+    min-height: 3rem; // avoid vertical shifting in multi-line words
+    user-select: none;
+  }
+
+  .nav-link {
+    border-radius: 0;
+    font-size: 0.95rem;
+    font-weight: 600;
+    letter-spacing: 1px;
+    display: table-cell;
+    vertical-align: middle;
+  }
+
+  .nav-item {
+    text-align: center;
+    display: table;
+    height: $tab-height;
+    &:hover {
+      .nav-link {
+        color: #f8f9facf;
+      }
+    }
+    &.active {
+      .nav-link {
+        color: #fcfcfc;
+      }
+    }
+  }
+
+  ul {
+    height: $tab-height * $tab-count;
+    margin-bottom: 2rem;
+    padding-left: 0;
+
+    li {
+      width: 100%;
+
+      &:last-child {
+        $cursor-width: 3px;
+
+        a {
+          position: relative;
+          left: $cursor-width / 2;
+          width: 100%;
+        }
+
+        &::after { // the cursor
+          display: table;
+          visibility: hidden;
+          content: "";
+          position: relative;
+          right: 1px;
+          width: $cursor-width;
+          height: $tab-cursor-height;
+          border-radius: 1px;
+          background-color: var(--nav-cursor-color);
+          pointer-events: none;
+        }
+      }
+    } // li
+
+    @mixin fix-cursor($top) {
+      top: $top;
+      visibility: visible;
+    }
+
+    @for $i from 1 through $tab-count {
+      $offset: $tab-count - $i;
+      $top: -$offset * $tab-height + $tab-cursor-height / 2;
+
+      @if $i < $tab-count {
+        > li.active:nth-child(#{$i}),
+        > li.nav-item:nth-child(#{$i}):hover {
+          ~li:last-child::after {
+            @include fix-cursor($top);
+          }
+        }
+      } @else {
+        > li.active:nth-child(#{$i}):last-child::after,
+        > li.nav-item:nth-child(#{$i}):last-child:hover::after {
+          @include fix-cursor($top);
+        }
+      }
+
+    } // @for
+
+  } // ul
+
+  .sidebar-bottom {
+    font-size: 1.2rem;
+    margin-bottom: 2.1rem;
+
+    @include ml-mr(auto);
+    @include pl-pr(1rem);
+
+    %icon {
+      width: 2.4rem;
+      text-align: center;
+    }
+
+    a {
+      @extend %icon;
+    }
+
+    #mode-toggle-wrapper {
+      @extend %icon;
+
+      i {
+        @include sidebar-links;
+
+        margin: 0;
+        font-size: 1.05rem;
+        text-align: center;
+        position: relative;
+        bottom: 1px;
+      }
+
+    }
+
+    .icon-border {
+      background-color: #525354;
+      content: "";
+      width: 3px;
+      height: 3px;
+      border-radius: 50%;
+      position: relative;
+      top: 12px;
+    }
+
+    a:hover,
+    #mode-toggle-wrapper i:hover {
+      color: #fff;
+    }
+
+  } // .sidebar-bottom
+
+} // #sidebar
+
+@media (hover: hover) {
+  #sidebar ul > li:last-child::after {
+    -webkit-transition: top 0.5s ease;
+    -moz-transition: top 0.5s ease;
+    -o-transition: top 0.5s ease;
+    transition: top 0.5s ease;
+  }
+}
+
+.profile-wrapper {
+  margin-top: 2rem;
+  width: 100%;
+}
+
+#search-result-wrapper {
+  display: none;
+  position: fixed;
+  top: 0;
+  padding-top: 3rem;
+  height: 100%;
+  overflow: auto;
+  .post-content {
+    margin-top: 2rem;
+  }
+}
+
+/* --- top-bar --- */
+
+#topbar-wrapper {
+  height: $topbar-height;
+  position: fixed;
+  top: 0;
+  left: 260px; /* same as sidebar width */
+  right: 0;
+  transition: top 0.2s ease-in-out;
+  z-index: 50;
+  border-bottom: 1px solid rgba(0, 0, 0, 0.07);
+  box-shadow: 0 3px 5px 0 rgba(0, 0, 0, 0.05);
+  background-color: var(--topbar-wrapper-bg);
+}
+
+#topbar {
+  i { // icons
+    color: #999;
+  }
+
+  #breadcrumb {
+    font-size: 1rem;
+    color: gray;
+    padding-left: 0.5rem;
+
+    a:hover {
+      @extend %link-hover;
+    }
+
+    span {
+      &:not(:last-child) {
+        &::after {
+          content: "›";
+          padding: 0 0.3rem;
+        }
+      }
+    }
+  }
+} // #topbar
+
+#sidebar-trigger,
+#search-trigger {
+  display: none;
+}
+
+#search-wrapper {
+  display: flex;
+  width: 95%;
+  border-radius: 1rem;
+  border: 1px solid var(--search-wrapper-bg);
+  background: var(--search-wrapper-bg);
+  padding: 0 0.5rem;
+  i {
+    z-index: 2;
+    font-size: 0.9rem;
+    color: var(--search-icon-color);
+  }
+  .fa-times-circle { /* button 'clean up' */
+    visibility: hidden;
+  }
+}
+
+#search-cancel { /* 'Cancel' link */
+  color: var(--link-color);
+  margin-left: 1rem;
+  display: none;
+}
+
+#search-input {
+  background: center;
+  border: 0;
+  border-radius: 0;
+  padding: 0.18rem 0.3rem;
+  color: var(--text-color);
+  font-size: 95%;
+
+  &:focus {
+    box-shadow: none;
+    background: center;
+    &.form-control {
+      &::-webkit-input-placeholder { @include input-placeholder; }
+      &::-moz-placeholder { @include input-placeholder; }
+      &:-ms-input-placeholder { @include input-placeholder; }
+      &::placeholder { @include input-placeholder; }
     }
   }
+}
 
-  p {
-    font-size: 1.08rem;
-    @include img(true);
-  }
-
-  ul {
-    // attribute 'hide-bullet' was added by liquid
-    .task-list-item[hide-bullet] {
-      list-style-type: none;
-
-      > i { // checkbox icon
-        margin: 0 0.4rem 0.2rem -1.4rem;
-        vertical-align: middle;
-        color: var(--checkbox-color);
-        &.checked {
-          color: var(--checkbox-checked-color);
-        }
-      }
+#search-hints {
+  display: none;
 
+  .post-tag {
+    display: inline-block;
+    line-height: 1rem;
+    font-size: 1rem;
+    background: var(--search-tag-bg);
+    border: none;
+    padding: 0.5rem;
+    margin: 0 1rem 1rem 0;
+    &::before {
+      content: "#";
+      color: var(--text-muted-color);
+      padding-right: 0.2rem;
     }
+  }
+}
 
-    input[type=checkbox] {
-      margin: 0 0.5rem 0.2rem -1.3rem;
-      vertical-align: middle;
+#search-results {
+  padding-bottom: 6rem;
+  a {
+    &:hover {
+      @extend %link-hover;
     }
 
-  } // ul
+    @extend %link-color;
+    @extend %no-bottom-border;
+    @extend %heading;
 
-  > ol, > ul {
-    padding-left: 2rem;
+    font-size: 1.4rem;
+    line-height: 2.5rem;
+  }
 
-    li {
-      + li {
-        margin-top: 0.3rem;
-      }
+  > div {
+    max-width: 100%;
 
-      ol, ul { // sub list
-        padding-left: 2rem;
-        margin-top: 0.3rem;
-      }
+    &:not(:last-child) {
+      margin-bottom: 1rem;
     }
 
-  }
-
-  > ol {
-    li {
-      padding-left: 0.25em;
+    i { // icons
+      color: #818182;
+      margin-right: 0.15rem;
+      font-size: 80%;
     }
-  }
 
-  dl > dd {
-    margin-left: 1rem;
+    > p {
+      overflow: hidden;
+      text-overflow: ellipsis;
+      display: -webkit-box;
+      -webkit-line-clamp: 3;
+      -webkit-box-orient: vertical;
+    }
   }
+} // #search-results
 
-} // .post-content
-
-.tag:hover {
-  @extend %tag-hover;
-}
-
-.post-tag {
-  display: inline-block;
-  min-width: 2rem;
+#topbar-title {
+  display: none;
+  font-size: 1.1rem;
+  font-weight: 600;
+  font-family: sans-serif;
+  color: var(--topbar-text-color);
   text-align: center;
-  background: var(--tag-bg);
-  border-radius: 0.3rem;
-  padding: 0 0.4rem;
-  color: inherit;
-  line-height: 1.3rem;
-  &:not(:last-child) {
-    margin-right: 0.2rem;
-  }
-
-  &:hover {
-    @extend %tag-hover;
-    border-bottom: none;
-    text-decoration: none;
-    color: #d2603a;
-  }
+  width: 70%;
+  overflow: hidden;
+  text-overflow: ellipsis;
+  word-break: keep-all;
+  white-space: nowrap;
 }
 
-/* --- buttons --- */
-.btn-lang {
-  border: 1px solid !important;
-  padding: 1px 3px;
-  border-radius: 3px;
-  color: var(--link-color);
-  &:focus {
-    box-shadow: none;
+#page {
+  .categories,
+  #tags,
+  #archives {
+    a:not(:hover) {
+      @extend %no-bottom-border;
+    }
   }
 }
 
-/* --- Effects classes --- */
+#mask {
+  display: none;
+  position: fixed;
+  top: 0;
+  right: 0;
+  bottom: 0;
+  left: 0;
+  height: 100%;
+  width: 100%;
+  z-index: 1;
 
-.loaded {
-  display: block !important;
-  @at-root .d-flex#{&} {
-    display: flex !important;
+  @at-root [#{$sidebar-display}] & {
+    display: block !important;
   }
 }
 
-.unloaded {
-  display: none !important;
-}
-
-.visible {
-  visibility: visible !important;
-}
-
-.hidden {
-  visibility: hidden !important;
-}
+/* --- main wrapper --- */
 
-.flex-grow-1 {
-  -ms-flex-positive: 1!important;
-  flex-grow: 1!important;
-}
+#main-wrapper {
+  background-color: var(--main-wrapper-bg);
+  position: relative;
+  min-height: 100vh;
+  padding-bottom: $footer-height;
 
-.btn-box-shadow {
-  box-shadow: 0 0 8px 0 var(--btn-box-shadow)!important;
+  @include pl-pr(0);
 }
 
-.topbar-up {
-  top: -3rem !important; /* same as topbar height. */
+#main > div.row:first-child > div {
+  &:nth-child(1),
+  &:nth-child(2) {
+    margin-top: $topbar-height; /* same as the height of topbar */
+  }
+  &:first-child {
+    /* 3rem for topbar, 6rem for footer */
+    min-height: calc(100vh - #{$topbar-height} - #{$footer-height} - #{$post-extend-min-height});
+  }
 }
 
-.no-text-decoration {
-  @include no-text-decoration;
+#post-wrapper {
+  min-height: calc(
+    100vh - #{$topbar-height} - #{$footer-height} - #{$post-extend-min-height}) !important;
 }
 
-.tooltip-inner { /* Overrided BS4 Tooltip */
-  font-size: 0.7rem;
-  max-width: 220px;
-  text-align: left;
+#topbar-wrapper.row,
+#main > .row,
+#search-result-wrapper > .row {
+  @include ml-mr(0);
 }
 
-.disabled {
-  color: rgb(206, 196, 196);
-  pointer-events: auto;
-  cursor: not-allowed;
-}
+/* --- button back-to-top --- */
 
-.hide-border-bottom {
-  border-bottom: none!important;
+#back-to-top {
+  display: none;
+  z-index: 1;
+  cursor: pointer;
+  position: fixed;
+  background: var(--button-bg);
+  color: var(--btn-backtotop-color);
+  height: 2.6em;
+  width: 2.7em;
+  border-radius: 50%;
+  border: 1px solid var(--btn-backtotop-border-color);
+  transition: 0.2s ease-out;
+  -webkit-transition: 0.2s ease-out;
 }
 
-.input-focus {
-  box-shadow: none;
-  border-color: var(--input-focus-border-color) !important;
-  background: center !important;
-  transition: background-color 0.15s ease-in-out,border-color 0.15s ease-in-out;
+#back-to-top:hover {
+  transform: translate3d(0, -5px, 0);
+  -webkit-transform: translate3d(0, -5px, 0);
 }
 
-/*--- Responsive Design ---*/
+/* --- Responsive Design --- */
 
 @media all and (max-width: 576px) {
 
@@ -1041,8 +1072,8 @@ img {
   }
 
   #post-wrapper {
-    min-height: calc(100vh - #{$topbar-height}
-      - #{$footer-height} - #{$post-extend-min-height}) !important;
+    min-height: calc(
+      100vh - #{$topbar-height} - #{$footer-height} - #{$post-extend-min-height}) !important;
     h1 {
       margin-top: 2.2rem;
       font-size: 1.55rem;
@@ -1069,18 +1100,17 @@ img {
       padding: 1.5rem 0;
       margin-bottom: 0.3rem;
       flex-wrap: wrap;
-      justify-content: left!important;
-      -ms-flex-pack: distribute!important;
-      justify-content: space-around!important;
+      -ms-flex-pack: distribute !important;
+      justify-content: space-around !important;
     }
-    .footer-left, .footer-right {
+    .footer-left,
+    .footer-right {
       text-align: center;
     }
   }
 
 }
 
-
 /* Hide Sidebar and TOC */
 @media all and (max-width: 830px) {
   %slide {
@@ -1088,10 +1118,19 @@ img {
     transition: transform 0.4s ease;
   }
 
-  html, body {
+  html,
+  body {
     overflow-x: hidden;
   }
 
+  .footnotes ol > li {
+    padding-top: 3.5rem;
+    margin-top: -3.2rem;
+    &:first-child {
+      margin-top: -3.5rem;
+    }
+  }
+
   [#{$sidebar-display}] {
 
     #sidebar {
@@ -1118,12 +1157,9 @@ img {
     }
   }
 
-  #topbar-wrapper {
-    @extend %slide;
-  }
-
   #main-wrapper {
     @extend %slide;
+
     padding-top: $topbar-height;
   }
 
@@ -1131,19 +1167,14 @@ img {
     width: 100%;
   }
 
-  #page h1.dynamic-title {
-    display: none;
-    ~.post-content {
-      margin-top: 3rem;
-    }
-  }
-
   #breadcrumb,
   #search-wrapper {
     display: none;
   }
 
   #topbar-wrapper {
+    @extend %slide;
+
     left: 0;
   }
 
@@ -1186,31 +1217,28 @@ img {
   }
 
   #tags {
-    -webkit-box-pack: center!important;
-    -ms-flex-pack: center!important;
-    justify-content: center!important;
+    -webkit-box-pack: center !important;
+    -ms-flex-pack: center !important;
+    justify-content: center !important;
   }
 
-  .footnotes ol > li {
-    padding-top: 3.5rem;
-    margin-top: -3.2rem;
-    &:first-child {
-      margin-top: -3.5rem;
+  #page h1.dynamic-title {
+    display: none;
+    ~ .post-content {
+      margin-top: 3rem;
     }
   }
-}
 
+}
 
 @media all and (min-width: 577px) and (max-width: 1199px) {
-  footer>.d-flex > div {
+  footer > .d-flex > div {
     width: 312px;
   }
 }
 
-
 /* Sidebar visible */
 @media all and (min-width: 831px) {
-
   /* Solved jumping scrollbar */
   html {
     overflow-y: scroll;
@@ -1269,7 +1297,8 @@ img {
   #sidebar {
     width: $sidebar-width-small;
     .sidebar-bottom {
-      a, span {
+      a,
+      span {
         width: 2rem;
       }
       .icon-border {
@@ -1292,12 +1321,13 @@ img {
 
   .site-title {
     font-size: 1.3rem;
-    margin-left: 0!important;
+    margin-left: 0 !important;
   }
 
   .site-subtitle {
-    font-size: 90%;
     @include ml-mr(1rem);
+
+    font-size: 90%;
   }
 
   #main-wrapper {
@@ -1325,14 +1355,13 @@ img {
   }
 
   #main > div.row {
-    -webkit-box-pack: center!important;
-    -ms-flex-pack: center!important;
-    justify-content: center!important;
+    -webkit-box-pack: center !important;
+    -ms-flex-pack: center !important;
+    justify-content: center !important;
   }
 }
 
-
-/*--- desktop mode, both sidebar and panel are visible ---*/
+/* --- desktop mode, both sidebar and panel are visible --- */
 
 @media all and (min-width: 1200px) {
 
@@ -1482,6 +1511,7 @@ img {
 
       .site-title {
         @extend %profile-ml;
+
         a {
           font-size: 1.7rem;
           letter-spacing: 1px;
@@ -1490,6 +1520,7 @@ img {
 
       .site-subtitle {
         @extend %profile-ml;
+
         word-spacing: 0;
         margin-top: 0.3rem;
       }
@@ -1537,9 +1568,9 @@ img {
       width: 100%;
 
       &.justify-content-center {
-        -webkit-box-pack: start!important;
-        -ms-flex-pack: start!important;
-        justify-content: flex-start!important;
+        -webkit-box-pack: start !important;
+        -ms-flex-pack: start !important;
+        justify-content: flex-start !important;
       }
 
       a {
@@ -1549,6 +1580,7 @@ img {
 
       i {
         @include icon-round(2rem);
+
         padding-top: 0.44rem;
         margin-top: .7rem; // multi line space
         bottom: 0;
@@ -1584,15 +1616,14 @@ img {
 
 } // min-width: 1650px
 
-
 @media all and (min-width: 1700px) {
   #topbar-wrapper {
-    padding-right: calc(100% - #{$sidebar-width-large}
-     - (1920px - #{$sidebar-width-large}) ) /* 100% - 350px - (1920px - 350px); */
+    /* 100% - 350px - (1920px - 350px); */
+    padding-right: calc(100% - #{$sidebar-width-large} - (1920px - #{$sidebar-width-large}));
   }
 
   #topbar {
-    max-width: calc(#{$main-content-max-width} + 20px)
+    max-width: calc(#{$main-content-max-width} + 20px);
   }
 
   #main > div.row {
diff --git a/_sass/addon/module.scss b/_sass/addon/module.scss
index 7292a37fadc..d1fe30b1ae8 100644
--- a/_sass/addon/module.scss
+++ b/_sass/addon/module.scss
@@ -100,6 +100,7 @@
 
 @mixin panel-label {
   @include label(inherit);
+
   display: block;
   line-height: 1.2;
   padding-top: 0.5rem;
diff --git a/_sass/jekyll-theme-chirpy.scss b/_sass/jekyll-theme-chirpy.scss
index e987f1ad2cf..2c556eee580 100644
--- a/_sass/jekyll-theme-chirpy.scss
+++ b/_sass/jekyll-theme-chirpy.scss
@@ -6,17 +6,18 @@
  * MIT Licensed
  */
 
-@import "colors/light-typography";
-@import "colors/dark-typography";
+@import
+  "colors/light-typography",
+  "colors/dark-typography",
 
-@import "addon/module";
-@import "addon/variables";
-@import 'addon/syntax';
-@import "addon/commons";
+  "addon/module",
+  "addon/variables",
+  "addon/syntax",
+  "addon/commons",
 
-@import "layout/home";
-@import "layout/post";
-@import "layout/tags";
-@import "layout/archives";
-@import "layout/categories";
-@import "layout/category-tag";
+  "layout/home",
+  "layout/post",
+  "layout/tags",
+  "layout/archives",
+  "layout/categories",
+  "layout/category-tag";
diff --git a/_sass/layout/archives.scss b/_sass/layout/archives.scss
index b3004a7316f..3da4d44e914 100644
--- a/_sass/layout/archives.scss
+++ b/_sass/layout/archives.scss
@@ -14,34 +14,12 @@
 
 #archives {
   letter-spacing: 0.03rem;
-  li {
-    font-size: 1.1rem;
-    line-height: 3rem;
-    &:nth-child(odd) {
-      background-color: var(--main-wrapper-bg, #fff);
-      background-image: linear-gradient(
-        to left, #fff, #fbfbfb, #fbfbfb, #fbfbfb, #fff);
-    }
-    > div {
-      white-space: nowrap;
-      overflow: hidden;
-      text-overflow: ellipsis;
-    }
-  }
 
   span.lead {
     font-size: 1.5rem;
     position: relative;
     left: 8px;
 
-    &:not(:first-child) {
-      position: relative;
-      left: 4px;
-      &::after {
-        left: 67px;
-      }
-    }
-
     &::after { /* Year dot */
       content: "";
       display: block;
@@ -59,8 +37,64 @@
       box-shadow: 0 0 2px 0 #c2c6cc;
       z-index: 1;
     }
+
+    &:not(:first-child) {
+      position: relative;
+      left: 4px;
+      &::after {
+        left: 67px;
+      }
+    }
+
   } // #archives span.lead
 
+  ul {
+    li {
+      font-size: 1.1rem;
+      line-height: 3rem;
+
+      div {
+        white-space: nowrap;
+        overflow: hidden;
+        text-overflow: ellipsis;
+
+        a {
+          /* post title in Archvies */
+          margin-left: 2.5rem;
+          position: relative;
+          top: 0.1rem;
+        }
+      }
+
+      &:nth-child(odd) {
+        background-color: var(--main-wrapper-bg, #fff);
+        background-image: linear-gradient(to left, #fff, #fbfbfb, #fbfbfb, #fbfbfb, #fff);
+      }
+
+      &::after {
+        @extend %date-timeline;
+
+        height: 2.8rem;
+        top: -1.3rem;
+      }
+
+      &:first-child::before {
+        @extend %date-timeline;
+
+        height: 3.06rem;
+        top: -1.61rem;
+      }
+    }
+
+    &:not(:last-child) > li:last-child::after {
+      height: 3.4rem;
+    }
+
+    &:last-child > li:last-child::after {
+      display: none;
+    }
+  } // #archives ul
+
   .date {
     white-space: nowrap;
     display: inline-block;
@@ -97,36 +131,8 @@
     }
   } // #archives .date
 
-  ul {
-    > li {
-      > div > a {
-        /* post title in Archvies */
-        margin-left: 2.5rem;
-        position: relative;
-        top: 0.1rem;
-      }
-      &::after {
-        @extend %date-timeline;
-        height: 2.8rem;
-        top: -1.3rem;
-      }
-      &:first-child::before {
-        @extend %date-timeline;
-        height: 3.06rem;
-        top: -1.61rem;
-      }
-    }
-    &:not(:last-child) > li:last-child::after {
-      height: 3.4rem;
-    }
-    &:last-child > li:last-child::after {
-      display: none;
-    }
-  } // #archives ul
-
 } // #archives
 
-
 @media all and (max-width: 576px) {
   #archives {
     margin-top: -1rem;
diff --git a/_sass/layout/categories.scss b/_sass/layout/categories.scss
index 4e123e97c45..8b32c67e7bd 100644
--- a/_sass/layout/categories.scss
+++ b/_sass/layout/categories.scss
@@ -11,6 +11,14 @@
   .card-header {
     padding-right: 12px;
   }
+
+  i {
+    &.far,
+    &.fas {
+      font-size: 86%; // fontawesome icons
+    }
+  }
+
   .list-group-item {
     border-left: none;
     border-right: none;
@@ -29,12 +37,6 @@
     @extend %category-icon-color;
   }
 
-  i {
-    &.far, &.fas {
-      font-size: 86%; // fontawesome icons
-    }
-  }
-
 } // .categories
 
 .category-trigger {
@@ -42,7 +44,7 @@
   height: 1.7rem;
   border-radius: 50%;
   text-align: center;
-  color: #6c757d!important;
+  color: #6c757d !important;
   > i.fas {
     position: relative;
     height: 0.7rem;
diff --git a/_sass/layout/category-tag.scss b/_sass/layout/category-tag.scss
index 88064d62e69..3549c918622 100644
--- a/_sass/layout/category-tag.scss
+++ b/_sass/layout/category-tag.scss
@@ -2,10 +2,17 @@
   Style for page Category and Tag
 */
 
-#page-category, #page-tag {
+.dash {
+  margin: 0 .5rem .6rem .5rem;
+  border-bottom: 2px dotted var(--dash-color);
+}
+
+#page-category,
+#page-tag {
   ul > li {
     line-height: 1.5rem;
     padding: 0.6rem 0;
+
     &::before { // dot
       background: #999;
       width: 5px;
@@ -17,14 +24,16 @@
       top: 0.6rem;
       margin-right: 0.5rem;
     }
+
     > a { /* post's title */
-      font-size: 1.1rem;
       @extend %no-bottom-border;
+
+      font-size: 1.1rem;
     }
+
     > span:last-child {
       white-space: nowrap;
-    }
-    /* post's date */
+    } /* post's date */
   }
 }
 
@@ -36,22 +45,19 @@
   font-size: 1.25rem;
 }
 
-a:hover {
-  #page-category &,
-  #page-tag &,
-  #access-lastmod & {
+#page-category,
+#page-tag,
+#access-lastmod {
+  a:hover {
     @extend %link-hover;
+
     margin-bottom: -1px; // Avoid jumping
   }
 }
 
-.dash {
-  margin: 0 .5rem .6rem .5rem;
-  border-bottom: 2px dotted var(--dash-color);
-}
-
 @media all and (max-width: 576px) {
-  #page-category, #page-tag {
+  #page-category,
+  #page-tag {
     ul > li {
       &::before {
         margin: 0 .5rem;
diff --git a/_sass/layout/home.scss b/_sass/layout/home.scss
index 520f3924d7f..a663d0dedf7 100644
--- a/_sass/layout/home.scss
+++ b/_sass/layout/home.scss
@@ -2,59 +2,6 @@
   Style for Homepage
 */
 
-#post-list {
-  margin-top: 1rem;
-  padding-right: 0.5rem;
-
-  .post-preview {
-    padding-top: 1.5rem;
-    padding-bottom: 1rem;
-    border-bottom: 1px solid var(--main-border-color);
-
-    h1 {
-      font-size: 1.4rem;
-      margin: 0;
-    }
-
-    .post-meta {
-      i {
-        font-size: 0.73rem;
-      }
-      span:not(:last-child) {
-        margin-right: 1.2rem;
-      }
-    }
-
-    .post-content {
-      margin-top: 0.6rem;
-      margin-bottom: 0.6rem;
-      color: var(--post-list-text-color);
-      > p {
-        /* Make preview shorter on the homepage */
-        margin: 0;
-        overflow: hidden;
-        text-overflow: ellipsis;
-        display: -webkit-box;
-        -webkit-line-clamp: 2;
-        -webkit-box-orient: vertical;
-      }
-    }
-
-    .pin {
-      > i {
-        transform: rotate(45deg);
-        padding-left: 3px;
-        color: var(--pin-color);
-      }
-      > span {
-        display: none;
-      }
-    }
-
-  } // .post-preview
-
-} // #post-list
-
 .pagination {
   font-size: 1rem;
   a:hover {
@@ -79,7 +26,7 @@
       font-family: 'Lato', sans-serif;
       background-color: var(--button-bg);
       &:hover {
-        background-color: var(--btn-paginator-hover-color)
+        background-color: var(--btn-paginator-hover-color);
       }
     }
     &.active {
@@ -109,6 +56,63 @@
 
 } // .pagination
 
+#post-list {
+  margin-top: 1rem;
+  padding-right: 0.5rem;
+
+  .post-preview {
+    padding-top: 1.5rem;
+    padding-bottom: 1rem;
+    border-bottom: 1px solid var(--main-border-color);
+
+    a:hover {
+      @extend %link-hover;
+    }
+
+    h1 {
+      font-size: 1.4rem;
+      margin: 0;
+    }
+
+    .post-meta {
+      i {
+        font-size: 0.73rem;
+      }
+      span:not(:last-child) {
+        margin-right: 1.2rem;
+      }
+    }
+
+    .post-content {
+      margin-top: 0.6rem;
+      margin-bottom: 0.6rem;
+      color: var(--post-list-text-color);
+      > p {
+        /* Make preview shorter on the homepage */
+        margin: 0;
+        overflow: hidden;
+        text-overflow: ellipsis;
+        display: -webkit-box;
+        -webkit-line-clamp: 2;
+        -webkit-box-orient: vertical;
+      }
+    }
+
+    .pin {
+      > i {
+        transform: rotate(45deg);
+        padding-left: 3px;
+        color: var(--pin-color);
+      }
+      > span {
+        display: none;
+      }
+    }
+
+  } // .post-preview
+
+} // #post-list
+
 /* Hide SideBar and TOC */
 @media all and (max-width: 830px) {
   .pagination {
diff --git a/_sass/layout/post.scss b/_sass/layout/post.scss
index 38266a979c7..abaf4c9e520 100644
--- a/_sass/layout/post.scss
+++ b/_sass/layout/post.scss
@@ -4,7 +4,7 @@
 
 @mixin btn-sharing-color($light-color, $important: false) {
   @if $important {
-    color: var(--btn-share-color, $light-color)!important;
+    color: var(--btn-share-color, $light-color) !important;
   } @else {
     color: var(--btn-share-color, $light-color);
   }
@@ -41,9 +41,10 @@
 
 .post-content {
   .preview-img {
+    @include align-center;
+
     margin-top: 0;
     margin-bottom: 2.5rem;
-    @include align-center;
   }
 }
 
@@ -63,6 +64,7 @@
 
   .btn {
     @include btn-post-nav;
+
     color: var(--link-color);
     &:hover {
       background: #2a408e;
@@ -71,6 +73,7 @@
     }
     &.disabled {
       @include btn-post-nav;
+
       pointer-events: auto;
       cursor: not-allowed;
       background: none;
@@ -139,17 +142,16 @@
   }
 }
 
-#toc li>a {
+#toc li > a {
   line-height: 1rem;
   padding-top: 0.5rem;
   padding-bottom: 0.5rem;
 }
 
-
-/*--- Related Posts ---*/
+/* --- Related Posts --- */
 
 #related-posts {
-  >h3 {
+  > h3 {
     @include label(1.1rem, 600);
   }
   .card {
@@ -165,7 +167,7 @@
     &:hover {
       -webkit-transform: translate3d(0, -3px, 0);
       transform: translate3d(0, -3px, 0);
-      box-shadow: 0 10px 15px -4px rgba(0,0,0,0.15);
+      box-shadow: 0 10px 15px -4px rgba(0, 0, 0, 0.15);
     }
   }
 
@@ -190,7 +192,7 @@
   ul {
     list-style-type: none;
     padding-inline-start: 1.5rem;
-    >li::before {
+    > li::before {
       background: #c2c9d4;
       width: 5px;
       height: 5px;
@@ -216,12 +218,17 @@
 }
 
 %btn-share-hovor {
-  color: var(--btn-share-hover-color)!important;
+  color: var(--btn-share-hover-color) !important;
 }
 
 .share-wrapper {
   vertical-align: middle;
   user-select: none;
+
+  i {
+    font-weight: 400;
+  }
+
   .share-icons {
     font-size: 1.2rem;
     a {
@@ -230,12 +237,12 @@
       }
       &:hover {
         text-decoration: none;
-        >i {
+        > i {
           @extend %btn-share-hovor;
         }
       }
     }
-    >i {
+    > i {
       padding-top: 0.35rem;
       &:hover {
         @extend %btn-share-hovor;
@@ -243,7 +250,7 @@
     }
     .fab {
       &.fa-twitter {
-        @include btn-sharing-color(rgba(29, 161, 242, 1.00));
+        @include btn-sharing-color(rgba(29, 161, 242, 1));
       }
       &.fa-facebook-square {
         @include btn-sharing-color(rgb(66, 95, 156));
@@ -264,9 +271,9 @@
 
 } // .share-wrapper
 
-
 .share-label {
   @include label(inherit, 400, inherit);
+
   &::after {
     content: ":";
   }
@@ -274,25 +281,22 @@
 
 .license-wrapper {
   line-height: 1.2rem;
-  >a {
+  > a {
     font-weight: 600;
     &:hover {
       @extend %link-hover;
     }
   }
-  i {
-    font-weight: 400;
-  }
+
   span:last-child {
     font-size: 0.85rem;
   }
 } // .license-wrapper
 
-
 @media all and (max-width: 576px) {
   .post-tail-bottom {
-    -ms-flex-wrap: wrap-reverse!important;
-    flex-wrap: wrap-reverse!important;
+    -ms-flex-wrap: wrap-reverse !important;
+    flex-wrap: wrap-reverse !important;
     >div:first-child {
       width: 100%;
       margin-top: 1rem;
@@ -301,8 +305,8 @@
 
   .post-content > div[class^='language-'] {
     @include ml-mr(-1.25rem);
-    border-radius: 0;
 
+    border-radius: 0;
     &::before { // the lang badge
       right: 1rem;
     }
@@ -323,10 +327,10 @@
         @include dot(0.5rem, 0.2rem);
       }
       &.flex-column {
-        -webkit-box-orient: horizontal!important;
-        -webkit-box-direction: normal!important;
-        -ms-flex-direction: row!important;
-        flex-direction: row!important;
+        -webkit-box-orient: horizontal !important;
+        -webkit-box-direction: normal !important;
+        -ms-flex-direction: row !important;
+        flex-direction: row !important;
       }
     }
   } // .post
diff --git a/docs/README.zh-CN.md b/docs/README.zh-CN.md
index 9a45e2444bf..3e1fae2ae99 100644
--- a/docs/README.zh-CN.md
+++ b/docs/README.zh-CN.md
@@ -53,8 +53,8 @@ Language: [English](https://github.com/cotes2020/jekyll-theme-chirpy#readme) | 
 
 有二法可得此主题:
 
-  - 从 [RubyGems](https://rubygems.org/gems/jekyll-theme-chirpy) 安装
-  - 从 GitHub 上 Fork
+- 从 [RubyGems](https://rubygems.org/gems/jekyll-theme-chirpy) 安装
+- 从 GitHub 上 Fork
 
 ### Rubygems 安装
 
@@ -86,9 +86,6 @@ $ bundle info --path jekyll-theme-chirpy
 
 或者你可以 [使用 starter template][use-starter] 来快速创建 Jekyll 站点，以省去复制主题 gem 文件的时间。
 
-[starter]: https://github.com/cotes2020/chirpy-starter
-[use-starter]: https://github.com/cotes2020/chirpy-starter/generate
-
 ### 在 GitHub 上 Fork
 
 [Fork **Chirpy**](https://github.com/cotes2020/jekyll-theme-chirpy/fork) 然后克隆到本地。
@@ -109,15 +106,15 @@ $ bash tools/init.sh
 
 上述脚本完成了以下工作:
 
-  1. 从你的仓库中删除了:
+1. 从你的仓库中删除了:
 
     - `.travis.yml`
     - `_posts` 下的文件
     - `docs` 目录
 
-  2. 如果使用了参数 `--no-gh`，则会怒删 `.github`。否则，将会配置 GitHub Actions：把 `.github/workflows/pages-deploy.yml.hook` 的后缀 `.hook` 去除，然后删除 `.github` 里的其他目录和文件。
+2. 如果使用了参数 `--no-gh`，则会怒删 `.github`。否则，将会配置 GitHub Actions：把 `.github/workflows/pages-deploy.yml.hook` 的后缀 `.hook` 去除，然后删除 `.github` 里的其他目录和文件。
 
-  3. 自动提交一个 Commit 以保存上述文件的更改。
+3. 自动提交一个 Commit 以保存上述文件的更改。
 
 ## 使用
 
@@ -159,19 +156,20 @@ $ docker run -it --rm \
 
 由于安全原因，GitHub Pages 的构建强制加了 `safe`参数，这导致了我们不能使用插件去创建所需的附加页面。因此，我们可以使用 GitHub Actions 去构建站点，把站点文件存储在一个新分支上，再指定该分支作为 Pages 服务的源。
 
-确保你的 Jekyll 站点存在文件 `/.github/workflows/pages-deploy.yml`。没有的话，新建并填入[示例工作流][workflow]的内容, 注意参数 `on.push.branches` 的值必须和你的仓库默认分支名相同。
+快速检查 GitHub Actions 构建需要的文件:
 
-[workflow]:https://github.com/cotes2020/jekyll-theme-chirpy/blob/master/.github/workflows/pages-deploy.yml.hook
+1. 确保你的 Jekyll 站点存在文件 `/.github/workflows/pages-deploy.yml`。没有的话，新建并填入[示例工作流][workflow]的内容, 注意参数 `on.push.branches` 的值必须和你的仓库默认分支名相同。
+2. 检查你的 Jekyll 站点是否有文件 `/tools/test.sh` 和 `/tools/deploy.sh`. 没有的话, 从本仓库拷贝到你的 Jekyll 项目.
 
 在 GitHub 把你的仓库命名为 `<GH-USERNAME>.github.io`，然后：
 
-  1. 推送任意一个 commit 到 `origin/master` 以触发 GitHub Actions workflow。一旦 build 完毕并且成功，远端将会自动出现一个新分支 `gh-pages` 用来存储构建的站点文件。
+1. 推送任意一个 commit 到 `origin/master` 以触发 GitHub Actions workflow。一旦 build 完毕并且成功，远端将会自动出现一个新分支 `gh-pages` 用来存储构建的站点文件。
 
-  2. 回到 GitHub 上的仓库， 通过 _Settings_ → _Options_ → _GitHub Pages_ 选择分支 `gh-pages` 作为[_发布源_](https://docs.github.com/en/github/working-with-github-pages/configuring-a-publishing-source-for-your-github-pages-site):
+2. 回到 GitHub 上的仓库， 通过 _Settings_ → _Options_ → _GitHub Pages_ 选择分支 `gh-pages` 作为[_发布源_](https://docs.github.com/en/github/working-with-github-pages/configuring-a-publishing-source-for-your-github-pages-site):
 
-      ![gh-pages-sources](https://cdn.jsdelivr.net/gh/cotes2020/chirpy-images/posts/20190809/gh-pages-sources.png)
+    ![gh-pages-sources](https://cdn.jsdelivr.net/gh/cotes2020/chirpy-images/posts/20190809/gh-pages-sources.png)
 
-  3. 按照 GitHub 指示的地址去访问你的网站。
+3. 按照 GitHub 指示的地址去访问你的网站。
 
 #### 部署到其他 Pages 平台
 
@@ -209,11 +207,9 @@ $ docker run -it --rm \
 
 :tada: 感谢所有参与代码贡献的小伙伴, 他们的 GayHub ID 在这个[列表](https://github.com/cotes2020/jekyll-theme-chirpy/graphs/contributors)。 另外, 提交过 issues(或者未被合并 PR) 的高富帅和白富美也不会被遗忘,他/她们帮助报告 bug、分享新点子或者启发了我写出更通俗易懂的文档。
 
-还有，感谢 [JetBrains][JB] 提供开源 License！
-
-[![JB-logo](https://cdn.jsdelivr.net/gh/cotes2020/chirpy-images/commons/jetbrains.svg)][JB]
+还有，感谢 [JetBrains][jb] 提供开源 License！
 
-[JB]:https://www.jetbrains.com/?from=jekyll-theme-chirpy
+[![JB-logo](https://cdn.jsdelivr.net/gh/cotes2020/chirpy-images/commons/jetbrains.svg)][jb]
 
 ## 赞助
 
@@ -222,3 +218,8 @@ $ docker run -it --rm \
 ## 许可证书
 
 本项目开源，基于 [MIT](https://github.com/cotes2020/jekyll-theme-chirpy/blob/master/LICENSE) 许可。
+
+[starter]: https://github.com/cotes2020/chirpy-starter
+[use-starter]: https://github.com/cotes2020/chirpy-starter/generate
+[workflow]:https://github.com/cotes2020/jekyll-theme-chirpy/blob/master/.github/workflows/pages-deploy.yml.hook
+[jb]:https://www.jetbrains.com/?from=jekyll-theme-chirpy
diff --git a/gulpfile.js/tasks/js.js b/gulpfile.js/tasks/js.js
index d6176539cc5..d159996d6bf 100644
--- a/gulpfile.js/tasks/js.js
+++ b/gulpfile.js/tasks/js.js
@@ -12,7 +12,6 @@ const fs = require('fs');
 
 const JS_ROOT = './assets/js';
 const jsDest = `${ JS_ROOT }/dist/`;
-const copyrightPath = `${ JS_ROOT }/.copyright`;
 
 function concatJs(files, output) {
   return src(files)
@@ -23,7 +22,7 @@ function concatJs(files, output) {
 
 function minifyJs() {
   return src(`${ jsDest }/*.js`)
-    .pipe(insert.prepend(fs.readFileSync(copyrightPath, 'utf8')))
+    .pipe(insert.prepend(fs.readFileSync(`${ JS_ROOT }/.copyright`, 'utf8')))
     .pipe(uglify({output: {comments: /^!|@preserve|@license|@cc_on/i}}))
     .pipe(dest(jsDest));
 }
diff --git a/tools/bump.sh b/tools/bump.sh
index 4285cfee04b..e9d1bc2e208 100755
--- a/tools/bump.sh
+++ b/tools/bump.sh
@@ -21,15 +21,15 @@ NODE_META="package.json"
 
 bump_assets() {
   _version="$1"
-  for i in ${!ASSETS[@]}; do
-    sed -i "s/v[[:digit:]]\.[[:digit:]]\.[[:digit:]]/v$_version/" ${ASSETS[$i]}
+  for i in "${!ASSETS[@]}"; do
+    sed -i "s/v[[:digit:]]\.[[:digit:]]\.[[:digit:]]/v$_version/" "${ASSETS[$i]}"
   done
 
   gulp
 }
 
 bump_gemspec() {
-  sed -i "s/[[:digit:]]\.[[:digit:]]\.[[:digit:]]/$1/" $GEM_SPEC
+  sed -i "s/[[:digit:]]\.[[:digit:]]\.[[:digit:]]/$1/" "$GEM_SPEC"
 }
 
 bump_node() {
@@ -39,9 +39,9 @@ bump_node() {
 }
 
 bump() {
-  bump_assets $1
-  bump_gemspec $1
-  bump_node $1
+  bump_assets "$1"
+  bump_gemspec "$1"
+  bump_node "$1"
 
   if [[ -n $(git status . -s) ]]; then
     git add .