navbar in bootstrap4
<div class="pos-f-t"> <div class="collapse" id="navbarToggleExternalContent"> <div class="bg-dark p-4"> <h4 class="text-white">Collapsed content</h4> <span class="text-muted">Toggleable via the navbar brand.</span> </div> </div> <nav class="navbar navbar-dark bg-dark"> <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarToggleExternalContent" aria-controls="navbarToggleExternalContent" aria-expanded="false" aria-label="Toggle navigation"> <span class="navbar-toggler-icon"></span> </button> </nav> </div>