vault/static/includes/_sidebar.html

<div class="col-md-4">
  <section class="card card-green" style="margin-bottom:2em;">
    <div class="card-header">
      <i class="fa fa-fw fa-gamepad"></i>&nbsp; Sonic
    </div>
  <div class="list-group list-group-flush">
    <a href="/monado-adventure" class="list-group-item list-group-item-action d-flex justify-content-between align-items-center">
      Sonic Monado Adventure
    </a>
  </div>
  </section>

</div>