ss="col-md-6">
                  <button type="button" class="btn btn-outline-primary btn-block"><i class="fa fa-bell"></i> .btn-block</button>
                  <button type="button" class="btn btn-outline-info btn-block btn-flat"><i class="fa fa-book"></i> .btn-block .btn-flat</button>
                  <button type="button" class="btn btn-outline-danger btn-block btn-sm"><i class="fa fa-book"></i> .btn-block .btn-sm</button>
                </div>
              </div>
            </div>
            <!-- 