Bootstrap显示和隐藏内容

<div class = row style = padding: 91px 100px 19px 50px;>

   <div class = show style = left-margin:10px; width:300px; background-color:#ccc;>
      This is an example for show class
   </div>

   <div class = hidden style = width:200px; background-color:#ccc;>
      This is an example for hide class
   </div>

</div>