diff --git a/_config.yml b/_config.yml
index 4358c6d..4b507b2 100755
--- a/_config.yml
+++ b/_config.yml
@@ -4,10 +4,10 @@ info:
   docs: https://xaoxuu.com/wiki/material-x/
   cdn: # 把对应的那一行注释掉就使用本地的文件
     css:
-      style: https://cdn.jsdelivr.net/gh/xaoxuu/cdn-material-x@19.4.18/css/style.css
+      style: https://cdn.jsdelivr.net/gh/xaoxuu/cdn-material-x@19.4.19/css/style.css
     js:
-      app: https://cdn.jsdelivr.net/gh/xaoxuu/cdn-material-x@19.4.18/js/app.js
-      search: https://cdn.jsdelivr.net/gh/xaoxuu/cdn-material-x@19.4.18/js/search.js
+      app: https://cdn.jsdelivr.net/gh/xaoxuu/cdn-material-x@19.4.19/js/app.js
+      search: https://cdn.jsdelivr.net/gh/xaoxuu/cdn-material-x@19.4.19/js/search.js
       volantis: https://cdn.jsdelivr.net/gh/xaoxuu/volantis@1/js/volantis.min.js
 
 
@@ -44,6 +44,16 @@ avatar_placeholder: https://cdn.jsdelivr.net/gh/xaoxuu/assets@master/avatar/avat
 date_format: 'YYYY-MM-DD' # 文章发布日期的格式
 updated_date_format: 'll' # 文章更新日期的格式
 
+# 幻灯片
+# backstretch:
+#   position: cover  # cover: 封面背景   full: 整个网页背景
+#   duration: 6000 # 持续时间（毫秒）
+#   fade: 1500     # 渐变（毫秒）
+#   images:
+#     - https://img.vim-cn.com/f6/78aed21213230b9220f310f9ea6c822b011846.jpg
+#     - https://img.vim-cn.com/d5/b004c81a13aea401375d03b1258ecadbfcbaa7.jpg
+#     - https://img.vim-cn.com/4c/8e7294998989454b2dcd2624373d5a699c4414.jpg
+
 
 ############################### 自定义 ###############################
 # page的封面
@@ -217,6 +227,19 @@ share:
 # footer: '页脚文字，支持[markdown](/)'
 
 
+############################### 评论系统 ###############################
+# disqus_shortname: 要使用哪个请复制到根目录配置文件！
+# livere_uid: 要使用哪个请复制到根目录配置文件！
+# gitalk: 要使用哪个请复制到根目录配置文件！
+#   clientID: 你的clientID
+#   clientSecret: 你的clientSecret
+#   repo: 你的repo名
+#   owner: 你的GitHub名
+#   admin: [] 至少填写你的GitHub名
+# leancloud: 要使用哪个请复制到根目录配置文件！
+#   app_id: 你的appId
+#   app_key: 你的appKey
+
 
 ############################### 杂项，请勿删除 ###############################
 #valine配置
diff --git a/layout/_partial/article.ejs b/layout/_partial/article.ejs
index e232ab8..ae9ed3d 100755
--- a/layout/_partial/article.ejs
+++ b/layout/_partial/article.ejs
@@ -81,6 +81,12 @@
   <% } %>
 <% }) %>
 
+<%
+  if (sections.indexOf('comments') < 0) {
+    page.comments = false;
+  }
+%>
+
 <!-- 根据页面mathjax变量决定是否加载MathJax数学公式js -->
 <% if (page.mathjax){ %>
   <%- partial('mathjax') %>
diff --git a/layout/_partial/cover.ejs b/layout/_partial/cover.ejs
index b457da6..c6c84f4 100644
--- a/layout/_partial/cover.ejs
+++ b/layout/_partial/cover.ejs
@@ -1,31 +1,10 @@
-<%
-var showCover = false;
-if (theme.cover) {
-  // 如果页面的Front-matter声明了cover，就取页面的值
-  if (page.cover != undefined) {
-    showCover = page.cover;
-  } else {
-    // 否则，如果是首页，只有首页的第一页显示
-    if (is_home()) {
-      if (page.prev) {
-        showCover = false;
-      } else {
-        showCover = true;
-      }
-    } else {
-      showCover = true;
-    }
-  }
-}
-%>
-
 <% if (showCover == true) { %>
   <div class="cover-wrapper">
-    <div class='cover <%- page.layout %> <%- is_home() ? theme.cover.height : "half" %>'>
+    <cover class='cover <%- page.layout %> <%- is_home() ? theme.cover.height : "half" %>'>
       <% if (theme.cover.scheme == 'search') { %>
         <%- partial('../_cover/search') %>
       <% } %>
-    </div>
+    </cover>
     <%- partial('header', null, {cache: false, path: path}) %>
   </div>
 <% } else { %>
diff --git a/layout/_partial/scripts.ejs b/layout/_partial/scripts.ejs
index 1565820..b728751 100755
--- a/layout/_partial/scripts.ejs
+++ b/layout/_partial/scripts.ejs
@@ -54,13 +54,44 @@
   </script>
 <% } %>
 
+<% if (theme.backstretch && (theme.backstretch.images || page.images)) { %>
+  <% var imgs = theme.backstretch.images || page.images; %>
+  <% var posi = null;
+  if (theme.backstretch.position == 'cover') {
+    posi = '.cover';
+  }
+   %>
+  <% if (imgs != undefined && theme.backstretch.position != undefined){ %>
+    <script src="https://cdnjs.cloudflare.com/ajax/libs/jquery-backstretch/2.0.4/jquery.backstretch.min.js"></script>
+    <script type="text/javascript">
+      $(function(){
+        if ('<%- posi %>') {
+          $('<%- posi %>').backstretch(
+          <%- '["' + imgs.join('", "') + '"]' %>,
+          {
+            duration: "<%- theme.backstretch.duration %>",
+            fade: "<%- theme.backstretch.fade %>"
+          });
+        } else {
+          $.backstretch(
+          <%- '["' + imgs.join('", "') + '"]' %>,
+          {
+            duration: "<%- theme.backstretch.duration %>",
+            fade: "<%- theme.backstretch.fade %>"
+          });
+        }
+      });
+    </script>
+  <% } %>
+<% } %>
+
 
 <%
   var enableDisqus = false;
   var enableLivere = false;
   var enableGitalk = false;
   var enableValine = false;
-  if (page && page.comments != false) {
+  if (page && page.comments == true) {
     if (config.disqus_shortname) {
       enableDisqus = true;
     }
diff --git a/layout/_third-party/comments.ejs b/layout/_third-party/comments.ejs
index 6b6661c..2543fd2 100644
--- a/layout/_third-party/comments.ejs
+++ b/layout/_third-party/comments.ejs
@@ -52,4 +52,6 @@
       <% } %>
     </section>
   </article>
+<% } else { %>
+  <% page.comments = false; %>
 <% } %>
diff --git a/layout/category.ejs b/layout/category.ejs
index ca39f69..fc1ea2a 100755
--- a/layout/category.ejs
+++ b/layout/category.ejs
@@ -1,3 +1,4 @@
+<% page.comments = false; %>
 <div class='l_main<%- page.sidebar == false ? ' no_sidebar' : '' %>'>
   <% if (site.posts && site.posts.length > 0) { %>
     <% if (page.layout == 'category') { %>
diff --git a/layout/layout.ejs b/layout/layout.ejs
index e15f045..29acf0c 100755
--- a/layout/layout.ejs
+++ b/layout/layout.ejs
@@ -2,8 +2,28 @@
 <html>
 <%- partial('_partial/head') %>
 <body>
-  <%- partial('_partial/cover') %>
-  <div class="l_body">
+  <%
+  var showCover = false;
+  if (theme.cover) {
+    // 如果页面的Front-matter声明了cover，就取页面的值
+    if (page.cover != undefined && page.cover != undefined) {
+      showCover = page.cover;
+    } else {
+      // 否则，如果是首页，只有首页的第一页显示
+      if (is_home()) {
+        if (page.prev) {
+          showCover = false;
+        } else {
+          showCover = true;
+        }
+      } else {
+        showCover = true;
+      }
+    }
+  }
+  %>
+  <%- partial('_partial/cover', {showCover: showCover}) %>
+  <div class="l_body<%- showCover ? '' : ' nocover' %>">
     <div class='body-wrapper'>
       <%- body %>
       <script>setLoadingBarProgress(60);</script>
diff --git a/layout/list.ejs b/layout/list.ejs
index 3dd243e..c41d87e 100755
--- a/layout/list.ejs
+++ b/layout/list.ejs
@@ -1,3 +1,4 @@
+<% page.comments = false; %>
 <div class='l_main<%- page.sidebar == false ? ' no_sidebar' : '' %>'>
   <% if (site.posts && site.posts.length > 0) { %>
     <section class="post-list">
diff --git a/layout/tag.ejs b/layout/tag.ejs
index 30a506d..7c62c10 100755
--- a/layout/tag.ejs
+++ b/layout/tag.ejs
@@ -1,3 +1,4 @@
+<% page.comments = false; %>
 <div class='l_main'>
   <% if (site.posts && site.posts.length > 0) { %>
     <% if (page.layout == 'tag') { %>
diff --git a/source/js/app.js b/source/js/app.js
index 8cce787..764ebdf 100755
--- a/source/js/app.js
+++ b/source/js/app.js
@@ -36,7 +36,7 @@ var customSearch;
 		const $coverAnchor = $('.cover-wrapper');
 		var showHeaderPoint = 0;
 		if ($coverAnchor[0]) {
-			showHeaderPoint = $coverAnchor[0].clientHeight - 64;
+			showHeaderPoint = $coverAnchor[0].clientHeight - 164;
 		}
 		var pos = document.body.scrollTop;
 		$(document, window).scroll(() => {
diff --git a/source/less/_base.less b/source/less/_base.less
index 8b8c719..2266292 100755
--- a/source/less/_base.less
+++ b/source/less/_base.less
@@ -46,17 +46,19 @@ fancybox{
   display: flex;
   justify-content: center;
 }
-
+.backstretch {
+  opacity: .75;
+}
 .cover-wrapper{
+  padding-bottom: 2px;
   .cover{
     top: 0;
     left: 0;
     max-width: 100%;
-    height: ~"calc(100vh - @{gap} - @{height_navbar})";
+    height: ~"calc(100vh)";
     display: flex;
     flex-wrap: nowrap;
     flex-direction: column;
-    margin-bottom: 2*@gap;
     align-items: center;
     align-self: center;
     align-content: center;
@@ -147,10 +149,15 @@ fancybox{
     &.half{
       height: ~"calc(60vh - @{gap} - @{height_navbar})";
       .title, .logo{
-        margin-top: ~"calc(20vh - 2*@{gap})";
+        margin-top: ~"calc(20vh - 4*@{gap})";
+      }
+      @media(max-width: @on_phone){
+        .title, .logo{
+          margin-top: ~"calc(32vh - 6*@{gap})";
+        }
       }
       .m_search{
-        margin-top: 2vh;
+        margin-top: 1vh;
       }
     }
     &, a{
@@ -483,7 +490,10 @@ ul.h-list {
 .l_body {
   position: relative;
   margin: @gap;
-  margin-top: @height_navbar + @gap;
+  margin-top: @gap;
+  &.nocover{
+    margin-top: @gap + @height_navbar;
+  }
   @media(max-width: @on_phone) {
     margin: @height_navbar + @gap 0 @gap;
     border-radius: 0;