<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>