<link href="//netdna.bootstrapcdn.com/bootstrap/3.1.0/css/bootstrap.min.css" rel="stylesheet" id="bootstrap-css"> <script src="//netdna.bootstrapcdn.com/bootstrap/3.1.0/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="row"> <div class="col-xs-18 col-sm-6 col-md-3"> <div class="thumbnail"> <img src="http://placehold.it/500x300" alt=""> <div class="caption"> <h4>Thumbnail label</h4> </div> </div> </div> <div class="col-xs-18 col-sm-6 col-md-3"> <div class="thumbnail"> <img src="http://placehold.it/500x300" alt=""> <div class="caption"> <h4>Thumbnail label</h4> </div> </div> </div> <div class="col-xs-18 col-sm-6 col-md-3"> <div class="thumbnail"> <img src="http://placehold.it/500x300" alt=""> <div class="caption"> <h4>Thumbnail label</h4> </div> </div> </div> <div class="col-xs-18 col-sm-6 col-md-3"> <div class="thumbnail"> <img src="http://placehold.it/500x300" alt=""> <div class="caption"> <h4>Thumbnail label</h4> </div> </div> </div> </div><!-- End row -->

.thumbnail { position: relative; padding: 0px; margin-bottom: 20px; } .thumbnail img { width: 100%; height:280px; }