<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"> <div class="panel-body"> <p>lorem ipsum</p> <button type="button" class="btn btn-success btn-sm">click me</button> </div> </div> </div>

.readbetter{ background-color:black; color:white; font-size:1.3em; text-shadow:0 1px 12px white; }

$(function(){ var elem = $('button'); elem.click(function(){ $('.container').toggleClass('readbetter'); }); });