diff --git a/app/views/libraries/_form.html.erb b/app/views/libraries/_form.html.erb
index 0bb1c30a..e1e6aa0b 100644
--- a/app/views/libraries/_form.html.erb
+++ b/app/views/libraries/_form.html.erb
@@ -1,146 +1,146 @@
 <p class="lineh-25 font-22 mb20">上传教学案例</p>
 <div class="library-form-container">
   <%= form_for(@library) do |f| %>
-    <% tag_ids = @library.library_tags.map(&:id) %>
-    <%= hidden_field_tag :apply_publish, false %>
-    <%= hidden_field_tag :tag_ids, tag_ids.join(',') %>
-    <div class="edu-back-white">
-      <div class="padding30">
-        <div class="clearfix">
-          <span class="upload_Title">标题</span>
-          <li class="fl">
-            <%= f.text_field :title, placeholder: '例如：软件工程教学案例', class: 'greyInput winput-300-35 mr20 fl' %>
-            <p style="height:20px;line-height:20px;"><span class="color-red none" id="title_notice">请输入标题</span></p>
-          </li>
-          <span class="color-grey-c font-12 fl mt6">简明扼要介绍文档/视频所包含的主要的内容</span>
+      <% tag_ids = @library.library_tags.map(&:id) %>
+      <%= hidden_field_tag :apply_publish, false %>
+      <%= hidden_field_tag :tag_ids, tag_ids.join(',') %>
+      <div class="edu-back-white">
+        <div class="padding30">
+          <div class="clearfix">
+            <span class="upload_Title">标题</span>
+            <li class="fl">
+              <%= f.text_field :title, placeholder: '例如：软件工程教学案例', class: 'greyInput winput-300-35 mr20 fl' %>
+              <p style="height:20px;line-height:20px;"><span class="color-red none" id="title_notice">请输入标题</span></p>
+            </li>
+            <span class="color-grey-c font-12 fl mt6">简明扼要介绍文档/视频所包含的主要的内容</span>
+          </div>
         </div>
-      </div>
-      <div class="padding30 bor-top-greyE">
-        <div class="clearfix">
-          <span class="upload_Title">描述</span>
-          <div class="fl" style="width: 1078px">
-            <div id="libraries_description" style="margin:0px">
-              <%= f.text_area :content  %>
+        <div class="padding30 bor-top-greyE">
+          <div class="clearfix">
+            <span class="upload_Title">描述</span>
+            <div class="fl" style="width: 1078px">
+              <div id="libraries_description" style="margin:0px">
+                <%= f.text_area :content  %>
+              </div>
+              <p style="height:22px;line-height:22px;"><span class="color-red none" id="des_notice">请输入描述内容</span></p>
             </div>
-            <p style="height:22px;line-height:22px;"><span class="color-red none" id="des_notice">请输入描述内容</span></p>
+          </div>
+          <div class="clearfix mb20">
+            <span class="upload_Title">标签</span>
+            <ul class="fl libraries_tab">
+              <% LibraryTag.where(nil).each do |tag| %>
+                  <li class="<%= tag_ids.include?(tag.id) ? 'active' : '' %>" data-id="<%= tag.id %>"><%= tag.name %></li>
+              <% end %>
+            </ul>
+          </div>
+          <div style="padding-left: 62px">
+            <%= render partial: 'attachments/from_libraries', locals: { container: @library } %>
+            <p style="height:22px;line-height:22px;"><span class="color-red none" id="file_notice">请上传附件</span></p>
           </div>
         </div>
-        <div class="clearfix mb20">
-          <span class="upload_Title">标签</span>
-          <ul class="fl libraries_tab">
-            <% LibraryTag.where(nil).each do |tag| %>
-              <li class="<%= tag_ids.include?(tag.id) ? 'active' : '' %>" data-id="<%= tag.id %>"><%= tag.name %></li>
-            <% end %>
+        <div class="padding30 bor-top-greyE">
+          <li class="lineh-25 color-grey-6 font-18 mb20">审核说明</li>
+          <ul class="font-16">
+            <li>平台管理员将对每天新上传的文档进行审核，审核通过的文档将公开显示，否则将私有化或移除</li>
           </ul>
         </div>
-        <div style="padding-left: 62px">
-          <%= render partial: 'attachments/from_libraries', locals: { container: @library } %>
-          <p style="height:22px;line-height:22px;"><span class="color-red none" id="file_notice">请上传附件</span></p>
+        <div class="padding30 bor-top-greyE">
+          <li class="lineh-25 color-grey-6 font-18 mb20">温馨提示</li>
+          <ul class="font-16">
+            <li>1.请勿上传已设置加密口令的文档资源；</li>
+            <li>2.可以上传符合教学案例标准的文档资料，如<a class="color-blue" target="_blank" href="https://www.educoder.net/boards/5909/topics/34799">案例入库标准</a>、<a target="_blank" class="color-blue" href="https://www.educoder.net/boards/5909/topics/34798">案例使用说明书</a>以及其他资料等，上传支持的文件最大容量：100MB；</li>
+            <li>3.请确保上传内容无侵权或违反国家关于互联网政策的不良行为；</li>
+            <li>4.请使用Chrome，Firefox，Safari，IE11（及以上版本）浏览器；</li>
+          </ul>
         </div>
       </div>
-      <div class="padding30 bor-top-greyE">
-        <li class="lineh-25 color-grey-6 font-18 mb20">审核说明</li>
-        <ul class="font-16">
-          <li>平台管理员将对每天新上传的文档进行审核，审核通过的文档将公开显示，否则将私有化或移除</li>
-        </ul>
-      </div>
-      <div class="padding30 bor-top-greyE">
-        <li class="lineh-25 color-grey-6 font-18 mb20">温馨提示</li>
-        <ul class="font-16">
-          <li>1.请勿上传已设置加密口令的文档资源；</li>
-          <li>2.可以上传符合教学案例标准的文档资料，如<a class="color-blue" target="_blank" href="https://www.educoder.net/boards/5909/topics/34799">案例入库标准</a>、<a target="_blank" class="color-blue" href="https://www.educoder.net/boards/5909/topics/34798">案例使用说明书</a>以及其他资料等，上传支持的文件最大容量：100MB；</li>
-          <li>3.请确保上传内容无侵权或违反国家关于互联网政策的不良行为；</li>
-          <li>4.请使用Chrome，Firefox，Safari，IE11（及以上版本）浏览器；</li>
-        </ul>
-      </div>
-    </div>
 
-    <div class="operate mt20 mb20 clearfix">
-      <% unless @library.published? %>
-        <%= link_to '申请发布', 'javascript:void(0)', class: 'white-btn edu-blueback-btn changebtn mr20 fl apply-publish-btn' %>
-      <% end %>
-      <%= link_to '保存', 'javascript:void(0)', class: 'white-btn edu-blueline-btn changebtn mr20 fl submit-btn' %>
-    </div>
+      <div class="operate mt20 mb20 clearfix">
+        <% unless @library.published? %>
+            <%= link_to '申请发布', 'javascript:void(0)', class: 'white-btn edu-blueback-btn changebtn mr20 fl apply-publish-btn' %>
+        <% end %>
+        <%= link_to '保存', 'javascript:void(0)', class: 'white-btn edu-blueline-btn changebtn mr20 fl submit-btn' %>
+      </div>
   <% end %>
 </div>
 
 <script>
-  /* ------------------------------- 描述md ------------------------------*/
-  editormd("libraries_description", {
-    width: "100%",
-    height: 400,
-    syncScrolling: "single",
-    //你的lib目录的路径，我这边用JSP做测试的
-    path: "/editormd/lib/",
-    tex: true,
-    watch:true,
-    toolbarIcons: function () {
-      // Or return editormd.toolbarModes[name]; // full, simple, mini
-      // Using "||" set icons align right.
-      return ["bold", "italic", "|", "list-ul", "list-ol", "|", "code", "code-block", "|", "testIcon", "testIcon1", '|', "image", "table", '|', "watch", "clear"]
-    },
+    /* ------------------------------- 描述md ------------------------------*/
+    editormd("libraries_description", {
+        width: "100%",
+        height: 400,
+        syncScrolling: "single",
+        //你的lib目录的路径，我这边用JSP做测试的
+        path: "/editormd/lib/",
+        tex: true,
+        watch:true,
+        toolbarIcons: function () {
+            // Or return editormd.toolbarModes[name]; // full, simple, mini
+            // Using "||" set icons align right.
+            return ["bold", "italic", "|", "list-ul", "list-ol", "|", "code", "code-block", "|", "testIcon", "testIcon1", '|', "image", "table", '|', "watch", "clear"]
+        },
 
-    toolbarCustomIcons: {
-      testIcon: "<a type=\"inline\" class=\"latex\" ><div class='zbg'></div></a>",
-      testIcon1: "<a type=\"latex\" class=\"latex\" ><div class='zbg_latex'></div></a>"
-    },
-    //这个配置在simple.html中并没有，但是为了能够提交表单，使用这个配置可以让构造出来的HTML代码直接在第二个隐藏的textarea域中，方便post提交表单。
-    saveHTMLToTextarea: true,
-    autoFocus: false,
-    // 用于增加自定义工具栏的功能，可以直接插入HTML标签，不使用默认的元素创建图标
-    dialogMaskOpacity: 0.6,
-    placeholder: "请添加描述",
-    imageUpload: true,
-    imageFormats: ["jpg", "jpeg", "gif", "png", "bmp", "webp", "JPG", "JPEG", "GIF", "PNG", "BMP", "WEBP"],
-    imageUploadURL: "<%= upload_with_markdown_path(container_id: 0, container_type: 'MarkDown') %>" //url
-  });
+        toolbarCustomIcons: {
+            testIcon: "<a type=\"inline\" class=\"latex\" ><div class='zbg'></div></a>",
+            testIcon1: "<a type=\"latex\" class=\"latex\" ><div class='zbg_latex'></div></a>"
+        },
+        //这个配置在simple.html中并没有，但是为了能够提交表单，使用这个配置可以让构造出来的HTML代码直接在第二个隐藏的textarea域中，方便post提交表单。
+        saveHTMLToTextarea: true,
+        autoFocus: false,
+        // 用于增加自定义工具栏的功能，可以直接插入HTML标签，不使用默认的元素创建图标
+        dialogMaskOpacity: 0.6,
+        placeholder: "请添加描述",
+        imageUpload: true,
+        imageFormats: ["jpg", "jpeg", "gif", "png", "bmp", "webp", "JPG", "JPEG", "GIF", "PNG", "BMP", "WEBP"],
+        imageUploadURL: "<%= upload_with_markdown_path(container_id: 0, container_type: 'MarkDown') %>" //url
+    });
 
-  var submitForm = function(){
-    var title = $("input[name='library[title]']").val();
-    var content = $("textarea[name='library[content]']").val();
+    var submitForm = function(){
+        var title = $("input[name='library[title]']").val();
+        var content = $("textarea[name='library[content]']").val();
 
-    if (!title || title.length == 0) {
-      $("#title_notice").removeClass("none");
-      return
-    }else{
-      $("#title_notice").addClass("none");
-    }
-    if (!content || content.length == 0) {
-      $("#des_notice").removeClass("none");
-      return
-    }else{
-      $("#des_notice").addClass("none");
-    }
+        if (!title || title.length == 0) {
+            $("#title_notice").removeClass("none");
+            return
+        }else{
+            $("#title_notice").addClass("none");
+        }
+        if (!content || content.length == 0) {
+            $("#des_notice").removeClass("none");
+            return
+        }else{
+            $("#des_notice").addClass("none");
+        }
 
-    if($('.attachments_fields .attachment').length == 0){
-      $("#file_notice").removeClass("none");
-      return
-    }else{
-      $("#file_notice").addClass("none");
-    }
+        if($('.attachments_fields .attachment').length == 0){
+            $("#file_notice").removeClass("none");
+            return
+        }else{
+            $("#file_notice").addClass("none");
+        }
 
-    $('.library-form-container form').submit();
-  };
+        $('.library-form-container form').submit();
+    };
 
-  $(function(){
-    $('.apply-publish-btn').on('click', function(){
-      $("input[name='apply_publish']").val(true);
-      submitForm();
-    });
-    $('.submit-btn').on('click', submitForm);
+    $(function(){
+        $('.apply-publish-btn').on('click', function(){
+            $("input[name='apply_publish']").val(true);
+            submitForm();
+        });
+        $('.submit-btn').on('click', submitForm);
 
-      $(".libraries_tab").on("click","li",function(){
-          if($(this).hasClass("active")){
-              $(this).removeClass("active")
-          }else{
-              $(this).addClass("active")
-          }
-          var ids = [];
-          $('.libraries_tab li.active').each(function(){
-            ids.push($(this).data('id'))
-          })
-          console.log('ids', ids)
-          $('#tag_ids').val(ids);
-      })
-  });
+        $(".libraries_tab").on("click","li",function(){
+            if($(this).hasClass("active")){
+                $(this).removeClass("active")
+            }else{
+                $(this).addClass("active")
+            }
+            var ids = [];
+            $('.libraries_tab li.active').each(function(){
+                ids.push($(this).data('id'))
+            })
+            console.log('ids', ids)
+            $('#tag_ids').val(ids);
+        })
+    });
 </script>
\ No newline at end of file
diff --git a/public/stylesheets/educoder/edu-all.css b/public/stylesheets/educoder/edu-all.css
index a0457410..0de1a091 100644
--- a/public/stylesheets/educoder/edu-all.css
+++ b/public/stylesheets/educoder/edu-all.css
@@ -649,7 +649,7 @@ a.enterLink{cursor: pointer;color: #418CCD!important;background: none!important;
 .second_4{min-height: 610px;padding-top: 190px;box-sizing: border-box;position: relative}
 .second_5{min-height: 617px;padding-top: 190px;box-sizing: border-box;position: relative}
 .second_6{min-height: 1053px;}
-.second_7{min-height: 1096px;}
+.second_7{min-height: 1078px;}
 .second_8{min-height: 727px;}
 
 /*代码标注*/
@@ -736,7 +736,7 @@ li.challenge_box:last-child{
     background: #47B6FC;
 }
 .ex_submit{
-    width: 360px;height: 70px;background: #2CDAD4;color: #fff!important;font-size: 30px;line-height: 70px;text-align: center;
+    width: 250px;height: 60px;background: #2CDAD4;color: #fff!important;font-size: 22px;line-height: 60px;text-align: center;
     margin:0px auto;display: block;float: left;margin:0px 35px;
 }
 table.tBodyScroll tbody tr td{