<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 ----------> <br> <div class="container"> <div class="alert alert-success"> <strong>Info:</strong> you should do an action. </div> <div class="alert alert-danger"> <strong>Danger:</strong> you shouldn't do an action! </div> </div>