        <div class="input-group">
                  <input id="appendedInputButton" class="form-control" size="16" type="text">
                  <span class="input-group-append">
                    <button class="btn btn-secondary" type="button">Go!</button>
                  </span>
                </div>
              </div>
            </div>
            <div class="form-group">
              <label class="col-form-label" for="appendedInputButtons">Two-button append</label>
              <div class="co