<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="//cdnjs.cloudflare.com/ajax/libs/jquery/3.2.1/jquery.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 class="row"> <div class="col-sm-3"> <img src="http://placehold.it/600x1600" alt="" class="img-responsive center-block"> </div> <div class="col-sm-6"> <div class="row"> <div class="col-sm-12"> <img src="http://placehold.it/600x450" alt="" class="img-responsive center-block"> </div> <div class="col-sm-12"> <br> <div class="row"> <div class="col-sm-6"> <img src="http://placehold.it/300x300" alt="" class="img-responsive center-block"> </div> <div class="col-sm-6"> <img src="http://placehold.it/300x300" alt="" class="img-responsive center-block"> </div> </div> </div> </div> </div> <div class="col-sm-3"> <div class="row"> <div class="col-sm-12"> <img src="http://placehold.it/300x250" alt="" class="img-responsive center-block"> </div> <div class="col-sm-12"> <br> <img src="http://placehold.it/300x250" alt="" class="img-responsive center-block"> </div> <div class="col-sm-12"> <br> <img src="http://placehold.it/300x250" alt="" class="img-responsive center-block"> </div> </div> </div> </div> </div>