Navigation tabs are one of the features specified in the "global.css" file which is found in the "custom" plug-in folder.
<div>
<ul class="tabnav nav-tabs">
<li class="active" data-value="tab-1"><a> Tab 1 </a></li>
<li class="" data-value="tab-2"><a> Tab 2 </a></li>
<li class="" data-value="tab-3"><a> Tab 3 </a></li>
</ul>
<div class="tab-content">
<div class="tab-pane active" id="tab-1">
<div class="order-tab">
Content 1
</div>
</div>
<div class="tab-pane" id="tab-2">
<div class="order-tab">
Content 2
</div>
</div>
<div class="tab-pane" id="tab-3">
<div class="order-tab">
Content 3
</div>
</div>
</div>
</div>