       </div>

            <div class="mb-3 mb-md-4">
              <h6 class="mb-2">Bootstrap</h6>
              <ul class="nav flex-column">

                <li class="nav-item">
                  <a href="http://getbootstrap.com/docs/4.3/components/alerts/" class="nav-link text-small" target="_blank">Alerts </a>

                </li>

                <li class="nav-item">
                  <a href="http://getbootstrap.com/docs/4.3/components/badge/" class="nav-link text-small" target="_blank">Badges </