anchor.diff: -<div class="container-fluid">
  + <style type="text/css">
  +			#container{
  +				padding-top: 10px;
  +			}
  +			
  +			h1{
  +				font-size: 28px;
  +				margin: 50px;
  +			}
  +			
  +			/* bubble */
  +			.tip-bubble {
  +			  position: relative;
  +			  background-color: #436EEE;
  +			  width: 500px;
  +			  padding: 20px;
  +			  color: #080808;
  +			  text-align: left;
  +			  border-radius: 10px;
  +			  margin: 50px;
  +			}
  +			 .tip-bubble:after {
  +			  content: '';
  +			  position: absolute;
  +			  width: 0;
  +			  height: 0;
  +			  border: 15px solid;
  +			}
  +			 
  +			.tip-bubble-left:after {
  +			  border-right-color: #202020;
  +			  top: 50%;
  +			  right: 100%;
  +			  margin-top: -15px;
  +			}
  +		
  +        </style>
  + 
  +  <div class="container-fluid">
     <div class="row">
   
       <div class="col-sm-2">
  
positive.code:               《<%= @course.name %> 》Discuss区
            </h3>
          </div>
                             </br>
          <div id="button-edit">
            
         
   <div class="panel-body" style="text-align:left;">
              <div class="table-responsive">
            <tbody>
               <br>
               <%if @course.diss == "暂无人发言" %>
                   <td><B>暂时无人发言！</B></td>
               <% end %>
  
negative.code:           <div class="input-group-addon"><span class="glyphicon glyphicon-arrow-right"></span></div>
            <%= f.text_area :tmp, class: 'form-control', placeholder: "输入发言内容" %>
          </div>
  
      <%= f.submit '提交', class: "btn btn-success btn-block" %>
      <%= link_to '取消', courses_path, :class => "btn btn-default btn-block" %>
    </div>
    
  <% end %>
  
            
  