<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>Create your snippet's HTML, CSS and Javascript in the editor tabs</h2> </div> </div> <div class="row"> <div class="col-xs-12 hidden-sm hidden-md hidden-lg"> <img class="img-responsive" src="http://placehold.it/50x50" /> <!--Mobile--> </div> <div class="hidden-xs col-sm-12 hidden-md hidden-lg"> <img class="img-responsive" src=" http://placehold.it/150x150" /> <!--Tab--> </div> <div class="hidden-xs hidden-sm col-md-12 hidden-lg"> <img class="img-responsive" src=" http://placehold.it/250x250" /> <!--Desktop--> </div> <div class="hidden-xs hidden-sm hidden-md col-lg-12"> <img class="img-responsive" src=" http://placehold.it/350x350" /> <!--Large--> </div> </div>