<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">
<div><h1>This is a paragraph.</h1></div>
<h1>This is a paragraph.</h1>
<h1>This is a paragraph.</h1>
<h1>This is a paragraph.</h1>
<div><h1>This is a paragraph.</h1></div>
</div>
<p>The :only-of-type selector matches every element that is the only child of its type, of its parent.</p>
</div>
