SOURCE

var YTMenu = (function() {

	function init() {
		
		[].slice.call( document.querySelectorAll( '.dr-menu' ) ).forEach( function( el, i ) {

			var trigger = el.querySelector( 'div.dr-trigger' ),
				icon = trigger.querySelector( 'span.dr-icon-menu' ),
				open = false;

			trigger.addEventListener( 'click', function( event ) {
				if( !open ) {
					el.className += ' dr-menu-open';
					open = true;
				}
			}, false );

			icon.addEventListener( 'click', function( event ) {
				if( open ) {
					event.stopPropagation();
					open = false;
					el.className = el.className.replace(/\bdr-menu-open\b/,'');
					return false;
				}
			}, false );

		} );

	}

	init();

})();

			<div class="layui-main layui-bg-cyan">
				
				<div class="side">
					<nav class="dr-menu">
						<div class="dr-trigger"><span class="dr-icon dr-icon-menu"></span><a class="dr-label">Account</a></div>
						<ul>
							<li><a class="dr-icon dr-icon-user" href="#">Jason Quinn</a></li>
							<li><a class="dr-icon dr-icon-camera" href="#">Videos</a></li>
							<li><a class="dr-icon dr-icon-heart" href="#">Favorites</a></li>
							<li><a class="dr-icon dr-icon-bullhorn" href="#">Subscriptions</a></li>
							<li><a class="dr-icon dr-icon-download" href="#">Downloads</a></li>
							<li><a class="dr-icon dr-icon-settings" href="#">Settings</a></li>
							<li><a class="dr-icon dr-icon-switch" href="#">Logout</a></li>
						</ul>
					</nav>
				</div>

				<div style="clear:both"></div>
			</div>

@font-face {
	font-family: 'icomoon';
	src:url('../fonts/icomoon.eot');
	src:url('../fonts/icomoon.eot?#iefix') format('embedded-opentype'),
		url('../fonts/icomoon.woff') format('woff'),
		url('../fonts/icomoon.ttf') format('truetype'),
		url('../fonts/icomoon.svg#icomoon') format('svg');
	font-weight: normal;
	font-style: normal;
}

.dr-menu {
	width: 100%;
	max-width: 400px;
	min-width: 300px;
	position: relative;
	font-size: 1.3em;
	line-height: 2.5;
	font-weight: 400;
	color: #fff;
	padding-top: 2em;
}

.dr-menu > div  {
	cursor: pointer;
	position: absolute;
	width: 100%;
	z-index: 100;
}

.dr-menu > div .dr-icon {
	top: 0;
	left: 0;
	position: absolute;
	font-size: 150%;
	line-height: 1.6;
	padding: 0 10px;
	-webkit-transition: all 0.2s ease;
	-moz-transition: all 0.2s ease;
	transition: all 0.2s ease;
}

.dr-menu.dr-menu-open > div .dr-icon {
	color: #60a773;
	left: 100%;
	-webkit-transform: translateX(-100%);
	-moz-transform: translateX(-100%);
	-ms-transform: translateX(-100%);
	transform: translateX(-100%);
}

.dr-menu > div .dr-icon:after {
	content: "\e008";
	position: absolute;
	font-size: 50%;
	line-height: 3.25;
	left: -10%;
	opacity: 0;
}

.dr-menu.dr-menu-open > div .dr-icon:after {
	opacity: 1;
}

.dr-menu > div .dr-label {
	padding-left: 3em;
	position: relative;
	display: block;
	color: #60a773;
	font-size: 0.9em;
	font-weight: 700;
	letter-spacing: 1px;
	text-transform: uppercase;
	line-height: 2.75;
	-webkit-transition: all 0.2s ease;
	-moz-transition: all 0.2s ease;
	transition: all 0.2s ease;
}

.dr-menu.dr-menu-open > div .dr-label {
	-webkit-transform: translateY(-90%);
	-moz-transform: translateY(-90%);
	-ms-transform: translateY(-90%);
	transform: translateY(-90%);
}

.dr-menu ul {
	padding: 0;
	margin: 0 3em 0 0;
	list-style: none;
	opacity: 0;
	position: relative;
	z-index: 0;
	pointer-events: none;
	-webkit-transition: opacity 0s linear 205ms;
	-moz-transition: opacity 0s linear 205ms;
	transition: opacity 0s linear 205ms;
}

.dr-menu.dr-menu-open ul {
	opacity: 1;
	z-index: 200;
	pointer-events: auto;
	-webkit-transition: opacity 0s linear 0s;
	-moz-transition: opacity 0s linear 0s;
	transition: opacity 0s linear 0s;
}

.dr-menu ul li {
	display: block;
	margin: 0 0 5px 0;
	opacity: 0;
	-webkit-transition: opacity 0.3s ease;
	-moz-transition: opacity 0.3s ease;
	transition: opacity 0.3s ease;
}

.dr-menu.dr-menu-open ul li {
	opacity: 1;
}

.dr-menu.dr-menu-open ul li:nth-child(2) {
	-webkit-transition-delay: 35ms;
	-moz-transition-delay: 35ms;
	transition-delay: 35ms;
}

.dr-menu.dr-menu-open ul li:nth-child(3) {
	-webkit-transition-delay: 70ms;
	-moz-transition-delay: 70ms;
	transition-delay: 70ms;
}

.dr-menu.dr-menu-open ul li:nth-child(4) {
	-webkit-transition-delay: 105ms;
	-moz-transition-delay: 105ms;
	transition-delay: 105ms;
}

.dr-menu.dr-menu-open ul li:nth-child(5) {
	-webkit-transition-delay: 140ms;
	-moz-transition-delay: 140ms;
	transition-delay: 140ms;
}

.dr-menu.dr-menu-open ul li:nth-child(6) {
	-webkit-transition-delay: 175ms;
	-moz-transition-delay: 175ms;
	transition-delay: 175ms;
}

.dr-menu.dr-menu-open ul li:nth-child(7) {
	-webkit-transition-delay: 205ms;
	-moz-transition-delay: 205ms;
	transition-delay: 205ms;
}

.dr-menu ul li a {
	display: inline-block;
	padding: 0 20px;
	color: #fff;
}

.dr-menu ul li a:hover {
	color: #60a773;
}

.dr-icon:before, 
.dr-icon:after {
	position: relative;
	font-family: 'icomoon';
	speak: none;
	font-style: normal;
	font-weight: normal;
	font-variant: normal;
	text-transform: none;
	-webkit-font-smoothing: antialiased;
}

.dr-menu ul .dr-icon:before {
	margin-right: 15px;
}

.dr-icon-bullhorn:before {
	content: "\e000";
}

.dr-icon-camera:before {
	content: "\e002";
}

.dr-icon-heart:before {
	content: "\e003";
}

.dr-icon-settings:before {
	content: "\e004";
}

.dr-icon-switch:before {
	content: "\e005";
}

.dr-icon-download:before {
	content: "\e006";
}

.dr-icon-user:before {
	content: "\e001";
}

.dr-icon-menu:before {
	content: "\e007";
}