fix: 解决请求 category.min.js 时报错不存在的问题

Fixes #489

src/css/common/components/page-header.css

@@ -8,7 +8,7 @@
     position: relative;
     width: 100%;
     overflow: hidden;
-    animation: header .5s;
+    animation: header 0.5s;
 
     &.single-center {
       &::after {
@@ -48,7 +48,7 @@
           height: 17.5rem;
 
           &::after {
-            content: '';
+            content: "";
             width: 150%;
             height: 4.375rem;
             background: var(--background-color);
@@ -175,6 +175,10 @@
   }
 
   @mixin screens-md {
+    & .pattern-title {
+      flex-direction: column;
+    }
+
     &.is-decorate {
       & .pattern-title {
         & h1 {
@@ -193,4 +197,4 @@
   100% {
     transform: translateY(0);
   }
-}
+}

src/css/theme/category/header.css

@@ -21,6 +21,12 @@
           font-size: 30px;
           vertical-align: middle;
         }
+
+        @mixin screens-md {
+          &::after {
+            border-right: none;
+          }
+        }
       }
 
       & .cat-des {

src/css/theme/tag/header.css

@@ -18,6 +18,12 @@
           font-size: 30px;
           vertical-align: middle;
         }
+
+        @mixin screens-md {
+          &::after {
+            border-right: none;
+          }
+        }
       }
     }
   }

src/page/category.ts

@@ -0,0 +1,2 @@
+// 创建一个空的类，防止请求 category.min.js 时报错
+export default class Category {}