                          class="form-control"
                          placeholder="Recipient's username"
                          aria-label="Recipient's username"
                          aria-describedby="basic-addon43" />
                        <span class="input-group-text" id="basic-addon43">@example.com</span>
                      </div>

                      <div class="input-group">
                        <span class="input-group-text" id="basic-addon44">https://example.com/users/</span>
  