diff --git a/src/main/twirl/gitbucket/core/helper/preview.scala.html b/src/main/twirl/gitbucket/core/helper/preview.scala.html
index 1bdb011..937752e 100644
--- a/src/main/twirl/gitbucket/core/helper/preview.scala.html
+++ b/src/main/twirl/gitbucket/core/helper/preview.scala.html
@@ -18,7 +18,7 @@
     <li class="active"><a href="#tab@uid" data-toggle="tab">Write</a></li>
     <li><a href="#tab@(uid+1)" data-toggle="tab" id="preview@uid">Preview</a></li>
   </ul>
-  @*<div class="tab-content">*@
+  <div class="tab-content">
     <div class="tab-pane active" style="margin-top: 4px;" id="tab@uid">
       <span id="error-content" class="error"></span>
       @textarea = {
@@ -37,7 +37,7 @@
       <div class="markdown-body" id="preview-area@uid">
       </div>
     </div>
-  @*</div>*@
+  </div>
 </div>
 <link  href="@assets/vendors/google-code-prettify/prettify.css" type="text/css" rel="stylesheet"/>
 <script src="@assets/vendors/google-code-prettify/prettify.js"></script>
diff --git a/src/main/twirl/gitbucket/core/issues/commentform.scala.html b/src/main/twirl/gitbucket/core/issues/commentform.scala.html
index c4d1aff..b293d8c 100644
--- a/src/main/twirl/gitbucket/core/issues/commentform.scala.html
+++ b/src/main/twirl/gitbucket/core/issues/commentform.scala.html
@@ -21,12 +21,12 @@
           elastic            = true,
           tabIndex           = 1
         )
-        <div style="text-align: right;">
+        <div class="text-right">
           <input type="hidden" name="issueId" value="@issue.issueId"/>
           @if((reopenable || !issue.closed) && (hasWritePermission || issue.openedUserName == loginAccount.get.userName)){
-            <input type="submit" class="btn btn-default" tabindex="3" formaction="@url(repository)/issue_comments/state" value="@{if(issue.closed) "Reopen" else "Close"}" id="action"/>
+            <input type="submit" class="btn btn-lg btn-default" tabindex="3" formaction="@url(repository)/issue_comments/state" value="@{if(issue.closed) "Reopen" else "Close"}" id="action"/>
           }
-          <input type="submit" class="btn btn-success" tabindex="2" formaction="@url(repository)/issue_comments/new" value="Comment"/>
+          <input type="submit" class="btn btn-lg btn-success" tabindex="2" formaction="@url(repository)/issue_comments/new" value="Comment"/>
         </div>
       </div>
     </div>
diff --git a/src/main/twirl/gitbucket/core/issues/create.scala.html b/src/main/twirl/gitbucket/core/issues/create.scala.html
index 0cace96..bf24d44 100644
--- a/src/main/twirl/gitbucket/core/issues/create.scala.html
+++ b/src/main/twirl/gitbucket/core/issues/create.scala.html
@@ -14,7 +14,7 @@
           <div class="panel panel-default issue-box">
             <div class="panel-body">
               <span id="error-title" class="error"></span>
-              <input type="text" name="title" class="form-control" value="" placeholder="Title" style="width: 680px;" autofocus/>
+              <input type="text" name="title" class="form-control input-lg" value="" placeholder="Title" style="width: 680px;" autofocus/>
               @helper.html.preview(
                 repository         = repository,
                 content            = "",
@@ -26,7 +26,7 @@
                 elastic            = true
               )
               <div class="align-right">
-                <input type="submit" class="btn btn-success" value="Submit new issue"/>
+                <input type="submit" class="btn btn-lg btn-success" value="Submit new issue"/>
               </div>
             </div>
           </div>
diff --git a/src/main/twirl/gitbucket/core/issues/editcomment.scala.html b/src/main/twirl/gitbucket/core/issues/editcomment.scala.html
index e9bda8c..0abd4e4 100644
--- a/src/main/twirl/gitbucket/core/issues/editcomment.scala.html
+++ b/src/main/twirl/gitbucket/core/issues/editcomment.scala.html
@@ -5,8 +5,8 @@
   <textarea id="edit-content-@commentId">@content</textarea>
 }
 <div>
-  <input type="button" id="cancel-comment-@commentId" class="btn btn-danger" value="Cancel"/>
-  <input type="button" id="update-comment-@commentId" class="btn btn-default pull-right" value="Update comment"/>
+  <input type="button" id="cancel-comment-@commentId" class="btn btn-lg btn-danger" value="Cancel"/>
+  <input type="button" id="update-comment-@commentId" class="btn btn-lg btn-default pull-right" value="Update comment"/>
 </div>
 <script>
 $(function(){
diff --git a/src/main/twirl/gitbucket/core/issues/editissue.scala.html b/src/main/twirl/gitbucket/core/issues/editissue.scala.html
index 9494542..1eddbeb 100644
--- a/src/main/twirl/gitbucket/core/issues/editissue.scala.html
+++ b/src/main/twirl/gitbucket/core/issues/editissue.scala.html
@@ -4,8 +4,8 @@
   <textarea id="edit-content">@content.getOrElse("")</textarea>
 }
 <div>
-  <input type="button" id="cancel-issue" class="btn btn-small btn-danger" value="Cancel"/>
-  <input type="button" id="update-issue" class="btn btn-small pull-right" value="Update comment"/>
+  <input type="button" id="cancel-issue" class="btn btn-lg btn-danger" value="Cancel"/>
+  <input type="button" id="update-issue" class="btn btn-lg btn-default pull-right" value="Update comment"/>
 </div>
 <script>
 $(function(){
diff --git a/src/main/twirl/gitbucket/core/pulls/compare.scala.html b/src/main/twirl/gitbucket/core/pulls/compare.scala.html
index 379a89c..b394c56 100644
--- a/src/main/twirl/gitbucket/core/pulls/compare.scala.html
+++ b/src/main/twirl/gitbucket/core/pulls/compare.scala.html
@@ -59,7 +59,7 @@
               <div class="panel panel-default issue-box">
                 <div class="panel-body">
                   <span class="error" id="error-title"></span>
-                  <input type="text" name="title" class="form-control" style="width: 680px" placeholder="Title"/>
+                  <input type="text" name="title" class="form-control input-lg" style="width: 680px" placeholder="Title"/>
                   @helper.html.preview(
                     repository         = repository,
                     content            = "",
@@ -77,7 +77,7 @@
                   <input type="hidden" name="commitIdFrom" value="@sourceId"/>
                   <input type="hidden" name="commitIdTo" value="@commitId"/>
                   <div class="align-right">
-                    <input type="submit" class="btn btn-success" value="Create pull request"/>
+                    <input type="submit" class="btn btn-lg btn-success" value="Create pull request"/>
                   </div>
                 </div>
               </div>
@@ -90,6 +90,11 @@
       </div>
     }
     @if(commits.isEmpty){
+      <div class="panel panel-default" style="padding: 20px; background-color: #eee; text-align: center;">
+        <h4>There isn't anything to compare.</h4>
+        <span class="strong">@originRepository.owner:@originId</span> and <span class="strong">@forkedRepository.owner:@forkedId</span> are identical.
+      </div>
+      @*
       <table class="table table-bordered table-hover table-issues">
         <tr>
           <td style="padding: 20px; background-color: #eee; text-align: center;">
@@ -98,6 +103,7 @@
           </td>
         </tr>
       </table>
+      *@
     } else {
       <div style="margin-bottom: 10px; padding: 4px;" class="panel panel-default">
         <table class="fill-width">
diff --git a/src/main/twirl/gitbucket/core/wiki/edit.scala.html b/src/main/twirl/gitbucket/core/wiki/edit.scala.html
index 3006696..b3b1b5b 100644
--- a/src/main/twirl/gitbucket/core/wiki/edit.scala.html
+++ b/src/main/twirl/gitbucket/core/wiki/edit.scala.html
@@ -21,7 +21,7 @@
     </ul>
     <form action="@url(repository)/wiki/@if(page.isEmpty){_new} else {_edit}" method="POST" validate="true">
       <span id="error-pageName" class="error"></span>
-      <input type="text" name="pageName" value="@pageName" class="form-control" style="width: 900px; font-weight: bold;" placeholder="Input a page name."/>
+      <input type="text" name="pageName" value="@pageName" class="form-control input-lg" style="width: 900px; font-weight: bold;" placeholder="Input a page name."/>
       @helper.html.preview(
         repository         = repository,
         content            = page.map(_.content).getOrElse(""),