feat(docs-site): make mobile-menu-nav postion sticky

affects: docs-site

Author: phphe

packages/docs-site/src/App.vue

@@ -1,8 +1,9 @@
 <template lang="pug">
-I18n
-div(v-is="layout")
-PageProgressBar
-HTMLHead
+.app-inner
+  I18n
+  div(v-is="layout")
+  PageProgressBar
+  HTMLHead
 </template>
 
 <script lang="ts">

packages/docs-site/src/layouts/default_layout.vue

@@ -148,6 +148,10 @@
     $h: 48px;
     height: $h;
     line-height: $h;
+    position: sticky;
+    top: 0;
+    background: #fff;
+    z-index: 1;
   }
   .mobile-main-title {
     font-size: 1.3em;