<link href="//maxcdn.bootstrapcdn.com/bootstrap/4.1.1/css/bootstrap.min.css" rel="stylesheet" id="bootstrap-css"> <script src="//maxcdn.bootstrapcdn.com/bootstrap/4.1.1/js/bootstrap.min.js"></script> <script src="//code.jquery.com/jquery-1.11.1.min.js"></script> <!------ Include the above in your HEAD tag ----------> <div class="pos-f-t"> <div class="collapse" id="navbarToggleExternalContent"> <div class="bg-dark p-4"> <h4 class="text-white">Collapsing Mobile Menu</h4> <span class="text-muted">You can add nav menu here for mobile</span> <ul class="nav nav-tabs"> <li class="nav-item"> <a class="nav-link active" href="#">Active</a> </li> <li class="nav-item"> <a class="nav-link" href="#">Link</a> </li> <li class="nav-item"> <a class="nav-link" href="https://www.google.com">Google</a> </li> </ul> </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>