<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 id="div1" style="width:80px;height:80px;background-color:red;"> </div><br>
<div id="div2" style="width:80px;height:80px;background-color:green;"></div><br>
<div id="div3" style="width:80px;height:80px;background-color:blue;"></div>
<h2>Make me first on the list!</h2>
<p>Good</p>
<p>Bye</p>
<p>for now.</p>
<button id="hide" type="button" class="btn btn-info">Hide</button>
<button id="show" type="button" class="btn btn-danger">Show</button>
</div>
</div>