diff --git a/app/views/projects/_course.html.erb b/app/views/projects/_course.html.erb
index 22ec78fa3..73e3a455b 100644
--- a/app/views/projects/_course.html.erb
+++ b/app/views/projects/_course.html.erb
@@ -45,7 +45,7 @@
 		<%= content_tag('span',  link_to("#{@project.members.count}", member_project_path(@project)), :class => "info") %>
 		<%= content_tag('span',  l(:label_x_member, :count => @project.members.count)) %>
 	</p>
-	<div class="buttons" style="margin-top:30px;margin-left:144px">
+	<div class="buttons_for_course" style="margin-top:30px;margin-left:144px">
 		<span class="info"></span>
 	    <%= join_in_course_for_list(@project, User.current,['regular'])%>
 	</div>
@@ -55,9 +55,11 @@
 <div class="add-info">
 	<div class="main-language" style="margin-left: 30px;margin-top:-10px">	
 		<%= content_tag "span","#{l(:label_duration_time)}:", :class => "course-font"%>
-		<%= DateTime.parse(Course.find_by_extra(@project.identifier).setup_time.to_s).strftime("%Y年%m月%d日").to_s unless Course.find_by_extra(@project.identifier).setup_time.nil? %>
-		<%= '-' unless Course.find_by_extra(@project.identifier).setup_time.nil? %>
-		<%= DateTime.parse(Course.find_by_extra(@project.identifier).endup_time.to_s).strftime("%Y年%m月%d日").to_s unless Course.find_by_extra(@project.identifier).endup_time.nil? %>
+		<% unless Course.find_by_extra(@project.identifier).nil? %>
+		<%= DateTime.parse(Course.find_by_extra(@project.identifier).setup_time.to_s).strftime("%Y年%m月%d日").to_s unless   Course.find_by_extra(@project.identifier).setup_time.nil? %>
+		<%= '-' unless  Course.find_by_extra(@project.identifier).setup_time.nil?  %>
+		<%= DateTime.parse(Course.find_by_extra(@project.identifier).endup_time.to_s).strftime("%Y年%m月%d日").to_s unless  Course.find_by_extra(@project.identifier).endup_time.nil? %>
+		<% end %>
 	</div>
 </div>
 
diff --git a/public/themes/redpenny-master/stylesheets/application.css b/public/themes/redpenny-master/stylesheets/application.css
index 8e34a62e4..261b8d4ab 100644
--- a/public/themes/redpenny-master/stylesheets/application.css
+++ b/public/themes/redpenny-master/stylesheets/application.css
@@ -1908,16 +1908,17 @@ div.avatar_user{
 	margin-bottom: 5px;
 }
 
-.buttons a, .buttons button{
+/*#added by nie*/
+.buttons_for_course a {
     display:block;
     float:left;
     margin:0 7px 0 0;
-    background-color:#ec6300;
+    background-color: #ec6300;
     border:1px solid #dedede;
     border-top:1px solid #eee;
     border-left:1px solid #eee;
 
-    font-family:"Lucida Grande", Tahoma, Arial, Verdana, sans-serif;
+    font-family:"微软雅黑", sans-serif;
     font-size:12px;
     line-height:130%;
     text-decoration:none;
@@ -1926,87 +1927,41 @@ div.avatar_user{
     cursor:pointer;
     padding:5px 10px 6px 7px; /* Links */
 }
-.buttons button{
-    width:auto;
-    overflow:visible;
-    padding:4px 10px 3px 7px; /* IE6 */
-}
-.buttons button[type]{
-    padding:5px 10px 5px 7px; /* Firefox */
-    line-height:17px; /* Safari */
-}
-*:first-child+html button[type]{
-    padding:4px 10px 3px 7px; /* IE7 */
-}
-.buttons button img, .buttons a img{
-    margin:0 3px -3px 0 !important;
-    padding:0;
-    border:none;
-    width:16px;
-    height:16px;
-}
+
 
 /* STANDARD */
 
-button:hover, .buttons a:hover{
+.buttons_for_course a:hover{
     background-color:#dff4ff;
     border:1px solid #c2e1ef;
     color:#336699;
 }
-.buttons a:active{
+.buttons_for_course a:active{
     background-color:#6299c5;
     border:1px solid #6299c5;
     color:#fff;
 }
 
-/* POSITIVE */
 
-button.positive, .buttons a.positive{
-    color:#529214;
-}
-.buttons a.positive:hover, button.positive:hover{
-    background-color:#E6EFC2;
-    border:1px solid #C6D880;
-    color:#529214;
-}
-.buttons a.positive:active{
-    background-color:#529214;
-    border:1px solid #529214;
-    color:#fff;
-}
 
-/* NEGATIVE */
-
-.buttons a.negative, button.negative{
-    color:#d12f19;
-}
-.buttons a.negative:hover, button.negative:hover{
-    background:#fbe3e4;
-    border:1px solid #fbc2c4;
-    color:#d12f19;
-}
-.buttons a.negative:active{
-    background-color:#d12f19;
-    border:1px solid #d12f19;
-    color:#fff;
-}
 
 /* REGULAR */
 
-button.regular, .buttons a.regular{
+.buttons_for_course a.regular{
     color:#ffffff;
 }
-.buttons a.regular:hover, button.regular:hover{
+.buttons_for_course a.regular:hover {
     background-color:#dff4ff;
     border:1px solid #c2e1ef;
     color:#336699;
 }
-.buttons a.regular:active{
+.buttons_for_course a.regular:active{
     background-color:#6299c5;
     border:1px solid #6299c5;
     color:#fff;
 }
 
+/* end */
 
 .course-font {
 	color:#8c8a8a;