<link href="//maxcdn.bootstrapcdn.com/bootstrap/3.3.0/css/bootstrap.min.css" rel="stylesheet" id="bootstrap-css"> <script src="//maxcdn.bootstrapcdn.com/bootstrap/3.3.0/js/bootstrap.min.js"></script> <script src="//code.jquery.com/jquery-1.11.1.min.js"></script> <!------ Include the above in your HEAD tag ----------> <div class="container"> <div class="row"> <h2>Screen Based Picture Optimization</h2> <p>Best viewed <a href="http://bootsnipp.com/iframe/n8poZ" target="_blank">full screen</a> <img class="visible-lg img-responsive" src="http://i.imgur.com/SXhJHgF.jpg" alt=""> <img class="visible-md img-responsive" src="http://i.imgur.com/6feZQD9.jpg" alt=""> <img class="visible-sm img-responsive" src="http://i.imgur.com/eiTwwWh.jpg" alt=""> <img class="visible-xs img-responsive" src="http://i.imgur.com/EJlJ4EF.jpg" alt=""> </div> </div>