storage/templates/core/main-nav.twig
<!-- Static navbar -->
<nav class="navbar navbar-default">
<div class="container-fluid">
<div class="navbar-header">
<button type="button" class="navbar-toggle collapsed" data-toggle="collapse"
data-target="#navbar" aria-expanded="false" aria-controls="navbar">
<span class="sr-only">Toggle navigation</span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
</button>
<a class="navbar-brand" href="/"></a>
</div>
<div id="navbar" class="navbar-collapse collapse">
<ul class="nav navbar-nav">
<li {% if activePage == 'about' %}class="active"{% endif %}><a href="/about">About</a></li>
<li {% if activePage == 'contact' %}class="active"{% endif %}><a href="/contact">Contact</a></li>
<li {% if activePage == 'for-guests' %}class="active"{% endif %}><a href="/for-guests">For Guests</a></li>
</ul>
</div>
<!--/.nav-collapse -->
</div>
<!--/.container-fluid -->
</nav>