<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="//cdnjs.cloudflare.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>
<link href="//www.meanthemes.com/demo/meanmenu/meanmenu.css" rel="stylesheet" id="bootstrap-css">
<script src="//www.meanthemes.com/demo/meanmenu/jquery.meanmenu.js"></script>
<div class="container">
<center><h2>Responsvie mega menu</h2></center>
<div class="row">
<div class="col-sm-12 px-0">
<div class="menubar">
<nav id="mobile-menu">
<ul>
<li><a href="index.html">Home</a></li>
<li>
<a href="#">Products</a>
<ul class="mega-menu">
<li>
<a href="#">Furniture Category</a>
<ul>
<li><a href="#">Small Storage</a></li>
<li><a href="#">Chaise and day beds</a></li>
<li><a href="#">Stools & Benches</a></li>
<li><a href="#">Lounge Chairs</a></li>
<li><a href="#">Sofa armchairs</a></li>
</ul>
</li>
<li>
<a href="#">Furniture Category</a>
<ul>
<li><a href="#">Decorative accessories</a></li>
<li><a href="#">Small Storage</a></li>
<li><a href="#">Chaise and day beds</a></li>
<li><a href="#">Stools & Benches</a></li>
<li><a href="#">Small Storage</a></li>