<h1>Menu Despegable <a href="http://creaticode.com/blog">creaticode.com</a></h1>
	<!-- Contenedor -->
	<ul id="accordion" class="accordion">
		<li>
			<div class="link"><i class="fa fa-paint-brush"></i>Diseño web<i class="fa fa-chevron-down"></i></div>
			<ul class="submenu">
				<li><a href="#">Photoshop</a></li>
				<li><a href="#">HTML</a></li>
				<li><a href="#">CSS</a></li>
				<li><a href="#">Maquetacion web</a></li>
			</ul>
		</li>
		<li class="default open">
			<div class="link"><i class="fa fa-code"></i>Desarrollo front-end<i class="fa fa-chevron-down"></i></div>
			<ul class="submenu">
				<li><a href="#">Javascript</a></li>
				<li><a href="#">jQuery</a></li>
				<li><a href="#">Frameworks javascript</a></li>
			</ul>
		</li>
		<li>
			<div class="link"><i class="fa fa-mobile"></i>Diseño responsive<i class="fa fa-chevron-down"></i></div>
			<ul class="submenu">
				<li><a href="#">Tablets</a></li>
				<li><a href="#">Dispositivos mobiles</a></li>
				<li><a href="#">Medios de escritorio</a></li>
				<li><a href="#">Otros dispositivos</a></li>
			</ul>
		</li>
		<li><div class="link"><i class="fa fa-globe"></i>Posicionamiento web<i class="fa fa-chevron-down"></i></div>
			<ul class="submenu">
				<li><a href="#">Google</a></li>
				<li><a href="#">Bing</a></li>
				<li><a href="#">Yahoo</a></li>
				<li><a href="#">Otros buscadores</a></li>
			</ul>
		</li>
	</ul>
* {
	margin: 0;
	padding: 0;
	-webkit-box-sizing: border-box;
	-moz-box-sizing: border-box;
	box-sizing: border-box;
}

body {
	background: #2d2c41;
	font-family: 'Open Sans', Arial, Helvetica, Sans-serif, Verdana, Tahoma;
}

ul {
	list-style-type: none;
}

a {
	color: #b63b4d;
	text-decoration: none;
}

/** =======================
 * Contenedor Principal
 ===========================*/
h1 {
 	color: #FFF;
 	font-size: 24px;
 	font-weight: 400;
 	text-align: center;
 	margin-top: 80px;
 }

h1 a {
 	color: #c12c42;
 	font-size: 16px;
 }

 .accordion {
 	width: 100%;
 	max-width: 360px;
 	margin: 30px auto 20px;
 	background: #FFF;
 	-webkit-border-radius: 4px;
 	-moz-border-radius: 4px;
 	border-radius: 4px;
 }

.accordion .link {
	cursor: pointer;
	display: block;
	padding: 15px 15px 15px 42px;
	color: #4D4D4D;
	font-size: 14px;
	font-weight: 700;
	border-bottom: 1px solid #CCC;
	position: relative;
	-webkit-transition: all 0.4s ease;
	-o-transition: all 0.4s ease;
	transition: all 0.4s ease;
}

.accordion li:last-child .link {
	border-bottom: 0;
}

.accordion li i {
	position: absolute;
	top: 16px;
	left: 12px;
	font-size: 18px;
	color: #595959;
	-webkit-transition: all 0.4s ease;
	-o-transition: all 0.4s ease;
	transition: all 0.4s ease;
}

.accordion li i.fa-chevron-down {
	right: 12px;
	left: auto;
	font-size: 16px;
}

.accordion li.open .link {
	color: #b63b4d;
}

.accordion li.open i {
	color: #b63b4d;
}
.accordion li.open i.fa-chevron-down {
	-webkit-transform: rotate(180deg);
	-ms-transform: rotate(180deg);
	-o-transform: rotate(180deg);
	transform: rotate(180deg);
}

.accordion li.default .submenu {display: block;}
/**
 * Submenu
 -----------------------------*/
 .submenu {
 	display: none;
 	background: #444359;
 	font-size: 14px;
 }

 .submenu li {
 	border-bottom: 1px solid #4b4a5e;
 }

 .submenu a {
 	display: block;
 	text-decoration: none;
 	color: #d9d9d9;
 	padding: 12px;
 	padding-left: 42px;
 	-webkit-transition: all 0.25s ease;
 	-o-transition: all 0.25s ease;
 	transition: all 0.25s ease;
 }

 .submenu a:hover {
 	background: #b63b4d;
 	color: #FFF;
 }

$(function() {
	var Accordion = function(el, multiple) {
		this.el = el || {};
		this.multiple = multiple || false;

		// Variables privadas
		var links = this.el.find('.link');
		// Evento
		links.on('click', {el: this.el, multiple: this.multiple}, this.dropdown)
	}

	Accordion.prototype.dropdown = function(e) {
		var $el = e.data.el;
			$this = $(this),
			$next = $this.next();

		$next.slideToggle();
		$this.parent().toggleClass('open');

		if (!e.data.multiple) {
			$el.find('.submenu').not($next).slideUp().parent().removeClass('open');
		};
	}	

	var accordion = new Accordion($('#accordion'), false);
});

External CSS

This Pen doesn't use any external CSS resources.

External JavaScript

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