bootstrap缩略图

<div class="container">
   <div class="row" >
      <div class="col-xs-6"  style="background-color: #dedef8; box-shadow: inset 1px -1px 1px #444, inset -1px 1px 1px #444;">
        
         <a href="#" class="thumbnail" >
  <img src="http://localhost:8081/xj/20191.jpg" alt="">
</a>
      </div>
     
     <div class="col-sm-6 col-md-3">
  <div class="thumbnail">
  <img src="http://localhost:8081/xj/201912.jpg">
  </div>
    </div>
   
</div>
<div class="row">
<div class="col-sm-6 col-md-6">
<ul class="thumbnails">
  <li class="span2">
    <div class="thumbnail">
      <img src="http://localhost:8081/xj/20191204.jpg" alt="">
      <h3>Thumbnail label</h3>
      <p>Thumbnail caption...</p>
    </div>
  </li>
  </ul>
</div>
</div>
</div>