zeus.ugent.be/layouts/partials/_about_sub_navbar.erb

<div class="subnav tabs">
  <ul>
    <li class="<%= 'is-active' if @selected == 'about'%>"><a href="/about/about">About</a></li>
    <li class="<%= 'is-active' if @selected == 'contact'%>"><a href="/about/contact">Contact</a></li>
    <li class="<%= 'is-active' if @selected == 'statuten'%>"><a href="/about/statuten">Statuten</a></li>
    <li class="<%= 'is-active' if @selected == 'historiek'%>"><a href="/about/historiek">Historiek</a></li>
    <li class="<%= 'is-active' if @selected == 'verslagen'%>"><a href="/about/verslagen">Verslagen</a></li>
  </ul>
</div>