front__coursera-responsive-design/templates/nav.hbs

<nav role="navigation" class="navbar navbar-default">
  <div class="container-fluid">
    <div class="navbar-header">
      <button type="button" aria-expanded="false" class="navbar-toggle collapsed"
        data-toggle="collapse"
        data-target="#animals-navbar-collapse">
        <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="#">Animals</a>
    </div><!-- .navbar-header -->

    <div class="hidden-xs">
      <ul class="nav navbar-nav navbar-left">
        <li class="{{activeGallery}}"><a href="#">Gallery</a></li>
      </ul>
    </div><!-- #animals-navbar-collapse -->

    <div class="collapse navbar-collapse" id="animals-navbar-collapse">
      <ul class="nav navbar-nav navbar-right">
        <li class="{{activeAbout}}"><a href="#about">About</a></li>
      </ul>
    </div><!-- #animals-navbar-collapse -->
  </div><!-- .container-fluid -->
</nav>