<nav>
<ul>
	<li><a href="https://facebook.com">About</a></li>
	<li><a href="#">Services</a></li>
	<li><a href="#">Work</a></li>
</ul>
<div class="button">
	<a class="btn-open" href="#"></a>
</div>
</nav>
<div class="overlay">
	<div class="wrap">
		<ul class="wrap-nav">
			<li><a href="#">About</a>
			<ul>
				<li><a href="#">About Company</a></li>
				<li><a href="#">Designers</a></li>
				<li><a href="#">Developers</a></li>
				<li><a href="#">Pets</a></li>
			</ul>
			</li>
			<li><a href="#">Services</a>
			<ul>
				<li><a href="https://www.google.hr/">Web Design</a></li>
				<li><a href="#">Development</a></li>
				<li><a href="#">Apps</a></li>
				<li><a href="#">Graphic design</a></li>
				<li><a href="#">Branding</a></li>
			</ul>
			</li>
			<li><a href="#">Work</a>
			<ul>
				<li><a href="#">Web</a></li>
				<li><a href="#">Graphic</a></li>
				<li><a href="#">Apps</a></li>
			</ul>
			</li>
		</ul>
		<div class="social">
			<a href="http://mario-loncarek.from.hr/">
			<div class="social-icon">
				<i class="fa fa-facebook"></i>
			</div>
			</a>
			<a href="#">
			<div class="social-icon">
				<i class="fa fa-twitter"></i>
			</div>
			</a>
			<a href="#">
			<div class="social-icon">
				<i class="fa fa-codepen"></i>
			</div>
			</a>
			<a href="#">
			<div class="social-icon">
				<i class="fa fa-behance"></i>
			</div>
			</a>
			<a href="#">
			<div class="social-icon">
				<i class="fa fa-dribbble"></i>
			</div>
			</a>
			<p>
				From: Zagreb, Croatia<br>
				 Site: <a href="http://mario-loncarek.from.hr/">mario-loncarek.from.hr</a>
			</p>
		</div>
	</div>
</div>
<div class="content">
	 Click on hamburger to open the overlay menu
</div>
body {
	margin:0;
	padding:0;
	background:#fff;
	font-family:'Montserrat',sans-serif;
	font-size:12px;
}
ul {
	margin:0;
	padding:0;
	text-decoration:none;
	list-style:none;
}
li {
	padding:0;
	margin:0;
}
nav {
	text-align:center;
	width:100%;
	position:relative;
	height:auto;
	overflow:hidden;
	background:none;
}
nav ul {
	text-align:center;
}
nav ul li {
	display:inline-block;
}
nav ul li a {
	color:#333;
	display:inline-block;
	padding:1em 3em;
	text-decoration:none;
	border-bottom:2px solid #fff;
	transition-property:all .2s linear 0s;
	-moz-transition:all .2s linear 0s;
	-webkit-transition:all .2s linear 0s;
	-o-transition:all .2s linear 0s;
	font-size:16px;
}
nav ul li a:hover {
	color: #34B484;
}
/*styling open close button*/
.button {
	display:inline;
	position:absolute;
	right:50px;
	top:6px;
	z-index:999;
	font-size:30px;
}
.button a {
	text-decoration:none;
}
.btn-open:after {
	color:#333;
	content:"\f0c9";
	font-family:"FontAwesome";
	transition-property:all .2s linear 0s;
	-moz-transition:all .2s linear 0s;
	-webkit-transition:all .2s linear 0s;
	-o-transition:all .2s linear 0s;
}
.btn-open:hover:after {
	color:#34B484;
}
.btn-close:after {
	color:#fff;
	content:"\f00d";
	font-family:"FontAwesome";
	transition-property:all .2s linear 0s;
	-moz-transition:all .2s linear 0s;
	-webkit-transition:all .2s linear 0s;
	-o-transition:all .2s linear 0s;
}
.btn-close:hover:after {
	color: #34B484;
}
/*overlay*/
.overlay {
	display:none;
	position:fixed;
	top:0;
	height:100%;
	width:100%;
	background:#333;
	overflow:auto;
	z-index:99;
}
.wrap {
	color:#e9e9e9;
	text-align:center;
	max-width:90%;
	margin:0 auto;
}
.wrap ul.wrap-nav {
	border-bottom:1px solid #575757;
	text-transform:capitalize;
	padding:150px 0px 100px;
}
.wrap ul.wrap-nav li {
	font-size:20px;
	display:inline-block;
	vertical-align:top;
	width:24%;
	position:relative;
}
.wrap ul.wrap-nav li a {
	color:#34B484;
	display:block;
	padding:8px 0;
	text-decoration:none;
	transition-property:all .2s linear 0s;
	-moz-transition:all .2s linear 0s;
	-webkit-transition:all .2s linear 0s;
	-o-transition:all .2s linear 0s;
}
.wrap ul.wrap-nav li a:hover {
	color:#f0f0f0;
}
.wrap ul.wrap-nav ul {
	padding:20px 0;
}
.wrap ul.wrap-nav ul li {
	display:block;
	font-size:13px;
	width:100%;
	color:#e9e9e9;
}
.wrap ul.wrap-nav ul li a {
	color:#f0f0f0;
}
.wrap ul.wrap-nav ul li a:hover {
	color:#34B484;
}
.social {
	font-size:25px;
	padding:20px;
}
.social p {
	margin:0;
	padding:20px 0 5px 0;
	line-height:30px;
	font-size:13px;
}
.social p a {
	color:#34B484;
	text-decoration:none;
	margin:0;
	padding:0;
}
.social-icon {
	width:80px;
	height:50px;
	background:#e9e9e9;
	color:#333;
	display:inline-block;
	margin:0 20px;
	transition-property:all .2s linear 0s;
	-moz-transition:all .2s linear 0s;
	-webkit-transition:all .2s linear 0s;
	-o-transition:all .2s linear 0s;
}
.social-icon:hover {
	background:#34B484;
	color:#f0f0f0;
}
.social-icon i {
	margin-top:12px;
}
@media screen and (max-width:48em) {
	.wrap ul.wrap-nav>li {
		width:100%;
		padding:20px 0;
		border-bottom:1px solid #575757;
	}
	.wrap ul.wrap-nav {
		padding:30px 0px 0px;
	}
	nav ul {
		opacity:0;
		visibility:hidden;
	}
	.social {
		color:#c1c1c1;
		font-size:25px;
		padding:15px 0;
	}
	.social-icon {
		width:100%;
		height:50px;
		background:#fff;
		color:#333;
		display:block;
		margin:5px 0;
	}
}
.content {
	width:100%;
	margin-top:200px;
	font-size:20px;
	color#333;
	text-align: center;
}
$(document).ready(function(){
    $(".button a").click(function(){
        $(".overlay").fadeToggle(200);
       $(this).toggleClass('btn-open').toggleClass('btn-close');
    });
});
$('.overlay').on('click', function(){
    $(".overlay").fadeToggle(200);   
    $(".button a").toggleClass('btn-open').toggleClass('btn-close');
    open = false;
});
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External CSS

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External JavaScript

  1. https://cdnjs.cloudflare.com/ajax/libs/jquery/2.1.3/jquery.min.js