<link href="//netdna.bootstrapcdn.com/bootstrap/3.0.0/css/bootstrap.min.css" rel="stylesheet" id="bootstrap-css"> <script src="//netdna.bootstrapcdn.com/bootstrap/3.0.0/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="container"> <div class="row"> <!-- Use outer div's id in JavaScript/jQuery to show/hide overlay --> <div id="overlay-container" class="overlay"> <a href="javascript:void(0)" class="closebtn" onclick="closeNav()">×</a> <div class="overlay-content"> <a href="">Menu</a> </div> </div> <!-- Button click to call overlay --> <input type="button" value="Show Overlay" onclick="openNav();" /> </div> </div>

.overlay { height: 0%; width: 100%; position: fixed; z-index: 1; top: 0; left: 0; background-color: rgb(0,0,0); background-color: rgba(0,0,0, 0.9); overflow-y: scroll; } .overlay-content { position: relative; top: 25%; width: 100%; text-align: center; margin-top: 30px; } .overlay a { padding: 8px; text-decoration: none; font-size: 36px; color: #818181; display: block; transition: 0.3s; } .overlay a:hover, .overlay a:focus { color: #f1f1f1; } .overlay .closebtn { position: absolute; top: 20px; right: 45px; font-size: 60px; } @media screen and (max-height: 450px) { .overlay { overflow-y: auto; } .overlay a { font-size: 20px } .overlay .closebtn { font-size: 40px; top: 15px; right: 35px; } }

function openNav() { document.getElementById("overlay-container").style.height = "100%"; } function closeNav() { document.getElementById("overlay-container").style.height = "0%"; }