填入缺失的空白以建立一個垂直導航欄
<nav class="@(6) bg-light"> <ul class="navbar-nav"> <li class="nav-item"> <a class="nav-link" href="#">連結 1</a> </li> <li class="nav-item"> <a class="nav-link" href="#">連結 2</a> </li> </ul> </nav>
<nav class="navbar bg-light"> <ul class="navbar-nav"> <li class="nav-item"> <a class="nav-link" href="#">連結 1</a> </li> <li class="nav-item"> <a class="nav-link" href="#">連結 2</a> </li> </ul> </nav>