diff --git a/docs/index.html b/docs/index.html
index 3f518db13..766d1acd8 100644
--- a/docs/index.html
+++ b/docs/index.html
@@ -62,7 +62,6 @@
           '/': 'Search'
         }
       },
-      formatUpdated: '{MM}/{DD} {HH}:{mm}',
       plugins: [
         function (hook, vm) {
           hook.beforeEach(function (html) {
diff --git a/index.html b/index.html
index 5d2319844..9c950964d 100644
--- a/index.html
+++ b/index.html
@@ -9,6 +9,7 @@
   <link rel="stylesheet" href="/themes/vue.css" title="vue">
   <link rel="stylesheet" href="/themes/dark.css" title="dark" disabled>
   <link rel="stylesheet" href="/themes/buble.css" title="buble" disabled>
+  <link rel="stylesheet" href="/themes/pure.css" title="pure" disabled>
   <style>
     nav.app-nav li ul {
       min-width: 100px;
@@ -52,7 +53,6 @@
           '/': 'Search'
         }
       },
-      formatUpdated: '{MM}/{DD} {HH}:{mm}',
       plugins: [
         function (hook, vm) {
           hook.beforeEach(function (html) {
@@ -68,7 +68,6 @@
               url = 'https://github.com/docsifyjs/docsify/blob/master/docs/' + vm.route.file
             }
             var editHtml = '[:memo: Edit Document](' + url + ')\n'
-
             return editHtml
               + html
               + '\n\n----\n\n'
@@ -82,9 +81,10 @@
   <script src="/lib/plugins/search.js"></script>
   <script src="/lib/plugins/emoji.js"></script>
   <script src="/lib/plugins/front-matter.js"></script>
-  <script src="//unpkg.com/prismjs/components/prism-bash.min.js"></script>
-  <script src="//unpkg.com/prismjs/components/prism-markdown.min.js"></script>
-  <script src="//unpkg.com/prismjs/components/prism-nginx.min.js"></script>
+  <script src="//cdn.jsdelivr.net/npm/prismjs/components/prism-bash.min.js"></script>
+  <script src="//cdn.jsdelivr.net/npm/prismjs/components/prism-markdown.min.js"></script>
+  <script src="//cdn.jsdelivr.net/npm/prismjs/components/prism-nginx.min.js"></script>
+  <script src="//cdn.jsdelivr.net/npm/prismjs/components/prism-php.min.js"></script>
 </body>
 
 </html>
diff --git a/src/core/event/scroll.js b/src/core/event/scroll.js
index 946589996..96cdade5c 100644
--- a/src/core/event/scroll.js
+++ b/src/core/event/scroll.js
@@ -79,9 +79,12 @@ function highlight(path) {
     const isInView =
       active.offsetTop >= wrap.scrollTop && cur <= wrap.scrollTop + height;
     const notThan = cur - curOffset < height;
-    const top = isInView ? wrap.scrollTop : notThan ? curOffset : cur - height;
 
-    sidebar.scrollTop = top;
+    sidebar.scrollTop = isInView
+      ? wrap.scrollTop
+      : notThan
+      ? curOffset
+      : cur - height;
   }
 }