uva-covid19-testing-communicator/communicator/templates/pages/404.html

    <!-- Page content -->
    <div class="container mt--8 pb-5">
      <div class="row justify-content-center">
        <div class="col-lg-5 col-md-7">
          <div class="card bg-secondary shadow border-0">
            <div class="card-header bg-transparent pb-5">

              <div class="text-muted text-center mt-2 mb-3">
              
                <span class="text-danger"> Oupssss, 404 </span>

              </div>
              
            </div>
          </div>
          <div class="row mt-3 text-center">
            <div class="col-12">
              <a href={{ url_for('index') }} class="text-light"><small>Go .. HOME</small></a>
            </div>
          </div>
        </div>
      </div>
    </div>