Add the required class name to center/justify the alignment of the pills.
<ul class="nav nav-pills @(13)">
<li><a href="#">Home</a></li>
<li><a href="#">HTML</a></li>
<li><a href="#">CSS</a></li>
<li><a href="#">JavaScript</a></li>
</ul>
<ul class="nav nav-pills nav-justified">
<li><a href="#">Home</a></li>
<li><a href="#">HTML</a></li>
<li><a href="#">CSS</a></li>
<li><a href="#">JavaScript</a></li>
</ul>