>
                  <ul class="nav nav-pills ml-auto">
                    <li class="nav-item">
                      <a class="nav-link active" href="#revenue-chart" data-toggle="tab">Area</a>
                    </li>
                    <li class="nav-item">
                      <a class="nav-link" href="#sales-chart" data-toggle="tab">Donut</a>
                    </li>
                  </ul>
                </div>
              </div><!-- /.card-header -->
              <div class="card-body">
     