<link href="//maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css" rel="stylesheet" id="bootstrap-css"> <script src="//maxcdn.bootstrapcdn.com/bootstrap/4.0.0/js/bootstrap.min.js"></script> <script src="//cdnjs.cloudflare.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script> <!------ Include the above in your HEAD tag ----------> <link rel="stylesheet" href="//maxcdn.bootstrapcdn.com/bootstrap/4.0.0-alpha.6/css/bootstrap.min.css" /> <nav class="navbar navbar-toggleable-md navbar-inverse fixed-top bg-inverse"> <button class="navbar-toggler navbar-toggler-right" type="button" data-toggle="collapse" data-target="#navbarCollapse" aria-controls="navbarCollapse" aria-expanded="false" aria-label="Toggle navigation"> <span class="navbar-toggler-icon"></span> </button> <a class="navbar-brand" href="">Brand</a> <div class="collapse navbar-collapse bg-inverse" id="navbarCollapse"> <ul class="navbar-nav mr-auto"> <li class="nav-item active"> <a class="nav-link" href="#">Home</a> </li> <li class="nav-item"> <a class="nav-link" href="#">Link</a> </li> <li class="nav-item"> <a class="nav-link" href="#">About</a> </li> </ul> <form class="form-inline mt-2 mt-md-0"> <input class="form-control mr-sm-2" type="text" placeholder="Search"> <button class="btn btn-outline-success my-2 my-sm-0" type="submit">Search</button> </form> </div> </nav>

.navbar-collapse { position: absolute; top: 54px; left: 0; padding-left: 15px; padding-right: 15px; padding-bottom: 15px; width: 100%; } .navbar-collapse.collapsing { height: auto; -webkit-transition: left 0.3s ease; -o-transition: left 0.3s ease; -moz-transition: left 0.3s ease; transition: left 0.3s ease; left: -100%; } .navbar-collapse.show { left: 0; -webkit-transition: left 0.3s ease-in; -o-transition: left 0.3s ease-in; -moz-transition: left 0.3s ease-in; transition: left 0.3s ease-in; } }