diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 5c1d486f9..ce21ea446 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -131,7 +131,7 @@ workflow. Runs can be checked [here](https://github.com/rhysd/actionlint/actions
 
 ## Maintain `all_webhooks.go`
 
-[`all_webhooks.go`(./all_webhooks.go) is a table all webhooks supported by GitHub Actions to trigger workflows. Note that
+[`all_webhooks.go`](./all_webhooks.go) is a table all webhooks supported by GitHub Actions to trigger workflows. Note that
 not all webhooks are supported by GitHub Actions.
 
 It is generated automatically with `go generate`. The command runs [`generate-webhook-events`](./scripts/generate-webhook-events)
diff --git a/playground/index.html b/playground/index.html
index a94f43423..7c8a2181e 100644
--- a/playground/index.html
+++ b/playground/index.html
@@ -44,14 +44,14 @@ <h2 class="subtitle">Static checker for GitHub Actions workflow files</h2>
     <main>
       <div id="editor" class="split-pane"></div>
       <div class="split-pane">
-        <div id="loading" class="notification has-text-centered is-size-5">Loading WebAssembly binary...</div>
-        <table id="lint-result" class="table is-hoverable">
+        <div id="loading" class="notification sticky has-text-centered is-size-5">Loading WebAssembly binary...</div>
+        <table id="lint-result" class="table sticky is-hoverable">
           <tbody id="lint-result-body">
           </tbody>
         </table>
-        <div id="error-msg" class="notification is-danger is-light is-size-5">
+        <div id="error-msg" class="notification sticky is-danger is-light is-size-5">
         </div>
-        <div id="success-msg" class="notification is-success is-light is-size-5">Yay! No error was detected.</div>
+        <div id="success-msg" class="notification sticky is-success is-light is-size-5">Yay! No error was detected.</div>
       </div>
     </main>
     <footer class="footer">
diff --git a/playground/style.css b/playground/style.css
index f4f4e2b1c..da699b1bd 100644
--- a/playground/style.css
+++ b/playground/style.css
@@ -62,6 +62,11 @@ main {
   cursor: pointer;
 }
 
+.sticky {
+  position: sticky;
+  top: 0;
+}
+
 footer {
   margin-top: 32px;
 }