<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>
<section style="background: #2ecc71; color: rgba(0, 0, 0, 0.5);">
<h2>Underline Fill</h2>
<nav class="fill">
<ul>
<li><a href="#">Home</a></li>
<li><a href="#">About</a></li>
<li><a href="#">Downloads</a></li>
<li><a href="#">More</a></li>
<li><a href="#">Nice staff</a></li>
</ul>
</nav>
</section>
