<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 class="row"> <div class="col-md-12"> <div class="circle"></div> <div class="square"></div> </div> </div> </div>

.circle { width: 100px; border-radius: 50px; background-color: #000; } .square { width: 100px; border-radius: 50px; background-color: #000; }