<ul class="navbar-nav">
  <li class="nav-item"><a class="nav-link" href="{{ pathto('index') }}">Home</a></li>
  <li class="nav-item"><a class="nav-link" href="{{ pathto('citation') }}">Citation</a></li>
  <li class="nav-item"><a class="nav-link" href="http://ibell.pythonanywhere.com">CoolProp Online</a></li>
  <li class="nav-item"><a class="nav-link" href="{{ pathto('coolprop/examples') }}">Examples</a></li>
  <li class="nav-item"><a class="nav-link" href="{{ pathto('develop/code') }}">Code</a></li>
  <li class="nav-item"><a class="nav-link" href="{{ pathto('coolprop/wrappers/index') }}">Interfaces</a></li>
</ul>