                      th:text="${user.username + '，您的身份是教师'}"></span>
                            </div>
                            <img class="img-profile rounded-circle"
                                 src="img/undraw_profile.svg">
                        </a>
                        <!-- Dropdown - User Information -->
                        <div aria-labelledby="userDropdown"
                             class="dropdown-menu dropdown-menu-right shadow animated--grow-in">
             