<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>
<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>Full Screen Menu</title>
</head>
<body>
<div class="container-fluid">
<div class="row">
<div class="col">
<div>
<span style="font-size:30px;cursor:pointer" onclick="setTimeout('openNav()', 1000)">☰</span>
<h2 class="logo"><a href="#">Website Name</a></h2>
</div>
<nav id="myNav" class="main-menu">
<a href="javascript:void(0)" class="closebtn" onclick="closeNav()">×</a>
<a href="#" class="logo">Website Name</a>
<menu class="menu-item">
<ul>
<li><a href="#">About</a></li>
<li><a href="#">services</a></li>
<li><a href="#">Client</a></li>
<li><a href="#">Contact</a></li>
</ul>
</menu>
</nav>
</div>
</div>
</div>
</body>