<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="container"> <div class="row"> <h2>Bootstrap 3.1 Gallery</h2> <hr> </div> <div class="row"> <span class="col-lg-3 col-sm-12 picture"> <img class="img-thumbnail" src="//placehold.it/200x200"> </span> <span class="col-lg-3 col-sm-12"> <img class="img-thumbnail" src="//placehold.it/200x200"> </span> <span class="col-lg-3 col-sm-12"> <img class="img-thumbnail" src="//placehold.it/200x200"> </span> <span class="col-lg-3 col-sm-12"> <img class="img-thumbnail" src="//placehold.it/200x200"> </span> <span class="col-lg-3 col-sm-12"> <img class="img-thumbnail" src="//placehold.it/200x200"> </span> <span class="col-lg-3 col-sm-12"> <img class="img-thumbnail" src="//placehold.it/200x200"> </span> <span class="col-lg-3 col-sm-12"> <img class="img-thumbnail" src="//placehold.it/200x200"> </span> <span class="col-lg-3 col-sm-12"> <img class="img-thumbnail" src="//placehold.it/200x200"> </span> </div> </div>