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CSS

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HTML 

              
                
<html lang="eng">
	<head>
		<META charset "utf-8">
		<title>BLAH BLAH</title>
		<meta name="viewport" content="width=evice-width, initial-scale=1.0">
		<link rel="stylesheet" type="text/css" href="css/styles.css">
		<!-- jquery for drop down menu for mobile and tablets -->
		<script type="text/javascript" src="https://ajax.googleapis.com/ajax/libs/jquery/1.7/jquery.min.js"></script>
		<script type="text/javascript">
		jQuery(document).ready(function($){

			/* prepend menu icon */
			$('#nav-wrap').prepend('<div id="menu-icon">Menu</div>');
			
			/* toggle nav */
			$("#menu-icon").on("click", function(){
				$("#nav").slideToggle();
				$(this).toggleClass("active");
			});

		});
		</script>
	</head>
	<body>
		<div id="pagewrap">

	<header>

		<h1>Demo: Mobile Navigation</h1>
		<p>Tutorial by <a href="https://twitter.com/nickla">Nick La</a>, <a href="http://webdesignerwall.com">Web Designer Wall</a> (<a href="http://webdesignerwall.com/tutorials/mobile-navigation-design-tutorial">related article</a>)</p>
	
		<nav id="nav-wrap">
			<ul id="nav" style="display: none;">
				<li><a href="#">Home</a></li>
				<li><a href="#">Sites
					</a>
					<ul>
						<li><a href="http://webdesignerwall.com">Web Designer Wall</a></li>
						<li><a href="http://themify.me">Themify</a></li>
						<li><a href="http://icondock.com">IconDock</a></li>
						<li><a href="http://ndesign-studio.com">N.Design Studio</a></li>
						<li><a href="http://bestwebgallery.com">Best Web Gallery</a></li>
					</ul>
				</li>
				<li><a href="#">About</a></li>
				<li><a href="#">Contact</a></li>
				<li><a href="#">Another Button</a></li>
			</ul>
		</nav>
		<!-- /nav-wrap -->
	
	</header>
	
	<div id="content">
		<h3>To see the mobile navigation, narrow your browser window or check with a mobile device.</h3>
		<p>Duis id tincidunt tortor. Curabitur placerat luctus lacinia. In hac habitasse platea dictumst. Suspendisse potenti. Nunc vestibulum, erat et pharetra aliquet, mi nunc iaculis erat, in pharetra libero felis sit amet ipsum. Lorem ipsum dolor sit amet, consectetur adipiscing elit. In volutpat augue nec leo lobortis fermentum. Lorem ipsum dolor sit amet, consectetur adipiscing elit. Nam eu ligula erat. Donec semper mauris et nibh pellentesque adipiscing. Curabitur quis ipsum eu lorem elementum vehicula. Aenean sed ante ut erat mollis aliquet. Vestibulum ante ipsum primis in faucibus orci luctus et ultrices posuere cubilia Curae; Ut consectetur euismod dolor. Proin eu pretium nunc.In sollicitudin blandit cursus. Pellentesque ornare, augue ac posuere consectetur, tellus ligula feugiat lorem, id imperdiet tellus tortor ut urna. Ut eleifend rhoncus augue sit amet dignissim. In mattis lobortis imperdiet. Aliquam molestie nisi et purus mattis volutpat. Cras dignissim, arcu vel pretium interdum, turpis sapien rutrum felis, non condimentum nulla orci ornare tellus. In laoreet tristique mauris, in accumsan quam commodo ac. Nam fringilla sapien sed nibh vehicula at rutrum metus blandit. Mauris eleifend, velit eget lacinia ullamcorper, elit sapien malesuada orci, fringilla imperdiet enim ante at velit. Vestibulum posuere dictum sapien, id volutpat sapien auctor non. Fusce convallis elit sagittis augue venenatis tempor in eget ligula. </p>
		<p>Curabitur at diam leo, eu convallis purus. Vestibulum ante ipsum primis in faucibus orci luctus et ultrices posuere cubilia Curae; Proin molestie nunc massa. Quisque tempor neque in sem laoreet vel dictum magna commodo. In elementum, turpis sed bibendum sollicitudin, augue leo malesuada dolor, ut hendrerit lectus libero id purus.</p>
		<p>Mauris ornare rhoncus sem, non euismod tortor rhoncus ac. Aliquam erat volutpat. Fusce justo purus, convallis sed feugiat nec, aliquet et ipsum. Nullam dapibus semper risus eu accumsan. Nulla facilisis eros ac ligula sodales suscipit. Fusce pellentesque iaculis dignissim. Phasellus tristique neque vitae justo laoreet tempus. Duis dignissim mollis lectus, id mollis tortor dignissim ut. Proin non velit arcu, sit amet laoreet massa. Aliquam gravida eros sit amet leo scelerisque molestie. Morbi et cursus felis. Pellentesque at dui nunc. Integer euismod tincidunt nisl, in iaculis tellus feugiat sed. Praesent semper augue eu augue ullamcorper mattis.</p>
		<p>Integer urna diam, viverra eu convallis at, luctus vel ipsum. Morbi varius eros neque, eu malesuada dolor. Etiam eget eleifend metus. Duis auctor orci et odio cursus adipiscing. Aliquam erat volutpat. In posuere faucibus justo, et faucibus lectus sodales ut. Vestibulum bibendum, dolor sed auctor rhoncus, massa nulla faucibus dui, in sollicitudin elit est at lorem. Proin aliquam gravida turpis et facilisis. Sed ornare enim et odio dictum dapibus ac vitae dolor. Duis sodales felis aliquet lectus commodo dictum. Etiam consectetur lacus sit amet lectus venenatis et iaculis urna ornare. Lorem ipsum dolor sit amet, consectetur adipiscing elit. Proin erat leo, condimentum sit amet volutpat in, auctor nec urna. Curabitur felis ligula, gravida at dignissim ac, faucibus vel metus. Ut euismod nibh sit amet nibh blandit in posuere libero scelerisque. Donec quis augue nibh, eu facilisis metus. Donec cursus condimentum erat quis sollicitudin. Mauris enim tortor, hendrerit ut pharetra non, eleifend non elit. Ut dapibus eleifend ipsum a rhoncus. Aenean eu ante felis, nec vulputate enim.</p>
		<p>Ut imperdiet, purus non pellentesque fringilla, erat est molestie nibh, sed tristique mi massa nec nisi. Cras ut urna est. Praesent eu ligula ut ligula tempus porttitor. In at sem ipsum, sed commodo felis. Nullam nec elit sapien. Donec at congue sapien. Mauris a diam nec felis auctor ultrices. Sed tempus mollis orci in viverra. Vivamus libero eros, dictum id aliquam in, tristique id sapien. Maecenas rhoncus malesuada aliquet. Morbi vulputate vulputate mauris quis condimentum. Ut ut ligula et mauris accumsan tristique ut nec lacus. Cras tempus pretium sagittis. Praesent porta libero nec magna vulputate porta. Vivamus in dolor eu lacus luctus auctor non ac turpis. Proin et rutrum dolor. Praesent venenatis purus convallis ipsum porttitor convallis consectetur orci condimentum. Curabitur ornare interdum pellentesque.</p>
	</div>

</div>
	</body>
	</html>
!

CSS 

              
                /************************************************************************************
GENERAL
*************************************************************************************/
body {
	font: .9em/150% Arial, Helvetica, sans-serif;
	color: #666;
}
a {
	text-decoration: none;
	color: #39C;
}
h1, h2 {          
	line-height: 120%;
	margin: 0 0 10px;
	color: #000;
}
header {
	content: " "; 
	display: table; 
}


/************************************************************************************
STRUCTURE
*************************************************************************************/
#pagewrap {
	width: 960px;
	max-width: 94%;
	margin: 30px auto 0;
}
#content {
	clear: both;
	border-top: solid 1px #ccc;
	padding-top: 20px;
	margin: 20px 0;
}

/************************************************************************************
NAV
*************************************************************************************/
#nav-wrap {
	margin-top: 20px;
}

/* menu icon */
#menu-icon {
	display: none; /* hide menu icon initially */
}

#nav, 
#nav li {
	margin: 0;
	padding: 0;
}
#nav li {
	list-style: none;
	float: left;
	margin-right: 5px;
}

/* nav link */
#nav a {
	padding: 4px 15px;
	display: block;
	color: #000;
	background: #ecebeb;
}
#nav a:hover {
	background: #f8f8f8;
}

/* nav dropdown */
#nav ul {
	background: #fff;
	padding: 2px;
	position: absolute;
	border: solid 1px #ccc;
	display: none; /* hide dropdown */
	width: 200px;
}
#nav ul li {
	float: none;
	margin: 0;
	padding: 0;
}
#nav li:hover > ul {
	display: block; /* show dropdown on hover */
}

/************************************************************************************
MOBILE
*************************************************************************************/
@media screen and (max-width: 600px) {

	/* nav-wrap */
	#nav-wrap {
		position: relative;
	}

	/* menu icon */
	#menu-icon {
		color: #000;
		width: 42px;
		height: 30px;
		background: #ecebeb url("http://lorempixel.com/output/nightlife-q-c-640-480-9.jpg") no-repeat 10px center;
		padding: 8px 10px 0 42px;
		cursor: pointer;
		border: solid 1px #666;
		display: block; /* show menu icon */
	}
	#menu-icon:hover {
		background-color: #f8f8f8;
	}
	#menu-icon.active {
		background-color: #bbb;
	}
	
	/* main nav */
	#nav {
		clear: both;
		position: absolute;
		top: 38px;
		width: 160px;
		z-index: 10000;
		padding: 5px;
		background: #f8f8f8;
		border: solid 1px #999;
		display: none; /* visibility will be toggled with jquery */
	}
	#nav li {
		clear: both;
		float: none;
		margin: 5px 0 5px 10px;
	}
	#nav a, 
	#nav ul a {
		font: inherit;
		background: none;
		display: inline;
		padding: 0;
		color: #666;
		border: none;
	}
	#nav a:hover, 
	#nav ul a:hover {
		background: none;
		color: #000;
	}
	
	/* dropdown */
	#nav ul {
		width: auto;
		position: static;
		display: block;
		border: none;
		background: inherit;
	}
	#nav ul li {
		margin: 3px 0 3px 15px;
	}

}

@media screen and (min-width: 600px) {

	/* ensure #nav is visible on desktop version */
	#nav {
		display: block !important;
	}

}
!

JS
!
999px

Console