           <button type="button" class="btn btn-secondary">1</button>
                <button type="button" class="btn btn-secondary">2</button>
                <button type="button" class="btn btn-secondary">3</button>
                <button type="button" class="btn btn-secondary">4</button>
              </div>
              <div class="input-group">
                <div class="input-group-prepend">
                  <div class="input-group-text" id="btnGroupAddon">@</div>
                </div>
        