vault/static/includes/_sidebar.html

<aside class="sidebar">
  <div class="card card-primary">
    <div class="card-header"><i class="fa fa-gamepad" aria-hidden="true"></i> Sonic</div>
      <ul class="card-menu">
          <li><a href='/monado-adventure/'>Sonic Monado Adventure</a></li>
      </ul>
  </div>
</aside>