<link href="//netdna.bootstrapcdn.com/bootstrap/3.2.0/css/bootstrap.min.css" rel="stylesheet" id="bootstrap-css"> <script src="//netdna.bootstrapcdn.com/bootstrap/3.2.0/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"> <button class="btn btn-primary btn-lg" data-toggle="modal" data-target="#myModal"> Launch demo modal </button> <div id="myModal" class="modal fade"> <div class="modal-dialog modal-sm"> <div class="modal-content"> <div class="modal-header"> Allow Children? </div> <div class="modal-body"> <p>One fine body...</p> <div class="btn-group btn-group-justified"> <div class="btn-group"><button type="button" class="btn btn-default" data-dismiss="modal">Close</button></div> <div class="btn-group"><button type="button" class="btn btn-primary">Save changes</button></div> </div> </div> </div> </div> </div> </div> </div>