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HTML

            
              <h1 class="page_title">Side Menu Animation</h1>
<h4 class="what_to_do">(click the menu icon)</h4>

<div class="side_menu">
	<div class="burger_box">
		<div class="menu-icon-container">
			<a href="#" class="menu-icon js-menu_toggle closed">
				<span class="menu-icon_box">
					<span class="menu-icon_line menu-icon_line--1"></span>
					<span class="menu-icon_line menu-icon_line--2"></span>
					<span class="menu-icon_line menu-icon_line--3"></span>
				</span>
			</a>
		</div>
	</div>
	<div class="container">
		<h2 class="menu_title">Menu Title</h2>
		<ul class="list_load">
			<li class="list_item"><a href="#">List Item 01</a></li>
			<li class="list_item"><a href="#">List Item 02</a></li>
			<li class="list_item"><a href="#">List Item 03</a></li>
			<li class="list_item"><a href="#">List Item 04</a></li>
			<li class="list_item"><a href="#">List Item 05</a></li>
			<li class="list_item"><a href="#">List Item 06</a></li>
			<li class="list_item"><a href="#">List Item 07</a></li>
			<li class="list_item"><a href="#">List Item 08</a></li>
		</ul>
		<div class="spacer_box"><p>This is a spacer box.</p></div>
	</div>
</div>
!

CSS

            
              @import url(https://fonts.googleapis.com/css?family=Raleway:300,700);
body {
	background: #048;
	background: -webkit-linear-gradient(left top, #027, #48a);
	background: -moz-linear-gradient(bottom right, #027, #48a);
	background: linear-gradient(to bottom right, #027, #48a);
	background-attachment: fixed;
	color: #fff;
	font-family: 'Raleway', Helvetica, Arial, sans-serif;
	font-size: 18px;
	font-weight: 300;
	line-height: 140%;
	margin: 0;
	height: 100%;
	padding: 0;
	width: 100%;
}

.page_title,
.what_to_do {
	font-weight: 300;
	line-height: 120%;
	text-align: center;
	text-shadow: 0 1px 5px rgba(0,0,0,.8);
	text-transform: uppercase;
}

/* PEN STYLES ========== */
a,
.side_menu {
	-webkit-transition: all 300ms ease-in-out;
	transition: all 300ms ease-in-out;
}

/* MENU CONTAINER ----- */
	.side_menu {
		background: rgba(0,20,60,.9);
		height: 100vh;
		left: -250px;
		position: fixed;
		top: 0;
		width: 250px;
	}
	.side_menu .container {
		padding: 0 1em;
	}

/* HAMBURGER STYLES ----- */
	.burger_box {
		display: block;
		float: right;
		margin-right: -45px;
	}
	.burger_box a.menu-icon {
		display: inline-block;
		float: none;
		height: 25px;
		padding: 10px;
		opacity: .5;
		width: 25px;
		z-index: 100;
	}
	.burger_box a.menu-icon:hover,
	.burger_box a.menu-icon.opened {
		opacity: 1;
	}
	.burger_box a.menu-icon.opened {
		background: rgba(0,20,60,.9);
	}
	.burger_box .menu-icon_box {
		display: inline-block;
		height: 25px;
		position: relative;
		text-align: left;
		width: 25px;
	}
	.burger_box .menu-icon_line {
		background: #fff;
		border-radius: 2px;
		display: inline-block;
		height: 3px;
		position: absolute;
		width: 100%;
	}
	.burger_box .menu-icon_line--1 {
		top: 2px;
	}
	.burger_box .menu-icon_line--2 {
		top: 10px;
	}
	.burger_box .menu-icon_line--3 {
		top: 18px;
	}
	.burger_box .menu-icon_line--1 {
		transition: top 200ms 250ms, transform 200ms;
		-webkit-transition: top 200ms 250ms, -webkit-transform 200ms;
	}
	.burger_box .menu-icon_line--2 {
		transition: opacity 0ms 300ms;
		-webkit-transition: opacity 0ms 300ms;
	}
	.burger_box .menu-icon_line--3 {
		transition: top 100ms 300ms, transform 200ms;
		-webkit-transition: top 100ms 300ms, -webkit-transform 200ms;
	}
	.burger_box .menu-icon.opened .menu-icon_box {
		transform: scale3d(0.9, 0.9, 0.9);
		-webkit-transform: scale3d(0.9, 0.9, 0.9);
	}
	.burger_box .menu-icon.opened .menu-icon_line {
		top: 10px;
	}
	.burger_box .menu-icon.opened .menu-icon_line--1 {
		transform: rotate3d(0, 0, 1, 45deg);
		-webkit-transform: rotate3d(0, 0, 1, 45deg);
		transition: top 100ms, transform 200ms 250ms;
		-webkit-transition: top 100ms, -webkit-transform 200ms 250ms;
	}
	.burger_box .menu-icon.opened .menu-icon_line--2 {
		opacity: 0;
		transition: opacity 200ms;
		-webkit-transition: opacity 200ms;
	}
	.burger_box .menu-icon.opened .menu-icon_line--3 {
		transform: rotate3d(0, 0, 1, -45deg);
		-webkit-transform: rotate3d(0, 0, 1, -45deg);
		transition: top 200ms, transform 200ms 250ms;
		-webkit-transition: top 200ms, -webkit-transform 200ms 250ms;
	}

/* STAGGER LIST ----- */
	.list_load {
		display: none;
		list-style: none;
		padding: 0;
	}
	.list_item {
		margin-left: -20px;
		opacity: 0;
		-webkit-transition: all 200ms ease-in-out;
		transition: all 200ms ease-in-out;
	}
	.list_item a {
		color: #fff;
		display: block;
		padding: 5px 10px;
		text-decoration: none;
	}
	.list_item a:hover {
		background: rgba(255,255,255,.2);
	}
!

JS

            
              // Requires jQuery

$(document).on('click','.js-menu_toggle.closed',function(e){
	e.preventDefault(); $('.list_load, .list_item').stop();
	$(this).removeClass('closed').addClass('opened');

	$('.side_menu').css({ 'left':'0px' });

	var count = $('.list_item').length;
	$('.list_load').slideDown( (count*.6)*100 );
	$('.list_item').each(function(i){
		var thisLI = $(this);
		timeOut = 100*i;
		setTimeout(function(){
			thisLI.css({
				'opacity':'1',
				'margin-left':'0'
			});
		},100*i);
	});
});

$(document).on('click','.js-menu_toggle.opened',function(e){
	e.preventDefault(); $('.list_load, .list_item').stop();
	$(this).removeClass('opened').addClass('closed');

	$('.side_menu').css({ 'left':'-250px' });

	var count = $('.list_item').length;
	$('.list_item').css({
		'opacity':'0',
		'margin-left':'-20px'
	});
	$('.list_load').slideUp(300);
});
!
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