<nav class="navbar navbar-expand-lg navbar-light bg-light">
              <a class="navbar-brand" href="#">Главная</a>
              <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarSupportedContent" aria-controls="navbarSupportedContent" aria-expanded="false" aria-label="Toggle navigation">
                <span class="navbar-toggler-icon"></span>
              </button>

              <div class="collapse navbar-collapse" id="navbarSupportedContent">
                <ul class="navbar-nav mr-auto">
                  <li class="nav-item active">
                    <a class="nav-link" href="#">Вопросы <span class="sr-only">(current)</span></a>
                  </li>
                </ul>
              </div>
        </nav>