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HTML

              
                <ul>
	<li class="block">
		<input type="checkbox" name="item" id="item1" />   
		<label for="item1"><i aria-hidden="true" class="icon-users"></i> Friends <span>124</span></label>
		<ul class="options">
			<li><a href="#"><i aria-hidden="true" class="icon-search"></i> Find New Friends</a></li>
			<li><a href="#"><i aria-hidden="true" class="icon-point-right"></i> Poke A Friend</a></li>
			<li><a href="#"><i aria-hidden="true" class="icon-fire"></i> Incinerate Existing Friends</a></li>
		</ul>
	</li>
	<li class="block">
		<input type="checkbox" name="item" id="item2" />   
		<label for="item2"><i aria-hidden="true" class="icon-film"></i> Videos <span>1,034</span></label>
		<ul class="options">
			<li><a href="#"><i aria-hidden="true" class="icon-movie"></i> My Videos <span>7</span></a></li>
			<li><a href="#"><i aria-hidden="true" class="icon-download"></i> My Downloaded Videos <span>3</span></a></li>
			<li><a href="#"><i aria-hidden="true" class="icon-warning"></i> My Well Dodgy Videos <span>1,024</span></a></li>
		</ul>
	</li>
	<li class="block">
		<input type="checkbox" name="item" id="item3" />   
		<label for="item3"><i aria-hidden="true" class="icon-images"></i> Galleries <span>4</span></label>
		<ul class="options">
			<li><a href="http://gattkins.deviantart.com/" target="_blank"><i aria-hidden="true" class="icon-deviantart"></i> My Deviant Art</a></li>
			<li><a href="http://dribbble.com/" target="_blank"><i aria-hidden="true" class="icon-dribbble"></i> Latest Dribbble Images</a></li>
			<li><a href="http://www.flickr.com/groups/catching_sun/pool/" target="_blank"><i aria-hidden="true" class="icon-flickr"></i> Sample Flickr Stream</a></li>
			<li><a href="https://picasaweb.google.com/lh/explore#utm_medium=embed&utm_source=pwalogin" target="_blank"><i aria-hidden="true" class="icon-picassa"></i> Sample Picasa Stream</a></li>
		</ul>
	</li>
	<li class="block">
		<input type="checkbox" name="item" id="item4" />   
		<label for="item4"><i aria-hidden="true" class="icon-microphone"></i> Podcasts <span>1</span></label>
		<ul class="options">
			<li><a href="https://css-tricks.com/css-tricks-screencasts-now-on-itunes/" target="_blank"><i aria-hidden="true" class="icon-music"></i> CSS-Tricks</a></li>
		</ul>
	</li>
	<li class="block">
		<input type="checkbox" name="item" id="item5" />   
		<label for="item5"><i aria-hidden="true" class="icon-android"></i> Robots <span>3</span></label>
		<ul class="options">
			<li><a href="http://en.wikipedia.org/wiki/HAL_9000" target="_blank"><i aria-hidden="true" class="icon-eye"></i> Hal 9000</a></li>
			<li><a href="http://en.wikipedia.org/wiki/Skynet_(Terminator)" target="_blank"><i aria-hidden="true" class="icon-cloud"></i> Skynet</a></li>
			<li><a href="http://en.wikipedia.org/wiki/Short_Circuit" target="_blank"><i aria-hidden="true" class="icon-reddit"></i> Johnny 5</a></li>
		</ul>
	</li>
</ul>
              
            
!

CSS

              
                * {
	-webkit-box-sizing: border-box;
	-moz-box-sizing: border-box;
	box-sizing: border-box;
}

body {
	font-family:arial, sans-serif;
	font-weight:normal;
	font-size:12px;
	background:#3f4348 url('http://www.frecosse.com/workshop/accordion_menu/bg.png');
}

ul {
	list-style:none;
	margin:0; 
	padding:0;
	width:300px;
	margin:0 auto;
	-moz-box-shadow: 0 0 5px #111;
	-webkit-box-shadow: 0 0 5px #111;
	box-shadow: 0 0 5px #111;
}

ul li label {
	background: #575e63; /* fallback colour */
	border-top:1px solid #878e98;
	border-bottom:1px solid #33373d;
	color: #fff;
	text-shadow: 0 1px 1px #000;
	letter-spacing: 0.09em;
	background: -webkit-gradient(linear, 0% 0%, 0% 100%, from(#575e63), to(#3f4347));
	background: -webkit-linear-gradient(top, #575e63, #3f4347);
	background: -moz-linear-gradient(top, #575e63, #3f4347);
	background: -ms-linear-gradient(top, #575e63, #3f4347);
	background: -o-linear-gradient(top, #575e63, #3f4347);
}

ul li input[type='checkbox'] {
	display: none;
}

ul li label {
	display:block;
	padding:12px;
	width:300px;
}

ul li i {
	font-size:18px;
	vertical-align: middle;
	width:20px;
	display:inline-block;
}

ul li span {
	display:inline;
	float:right;
	background:#48515c;
	border:1px solid #3c434c;
	border-bottom:1px solid #707781;
	padding:4px 6px;
	font-size:10px;
	-moz-border-radius: 12px;
	border-radius: 12px;
	-moz-box-shadow: inset 0 0 10px #111;
	-webkit-box-shadow: inset 0 0 10px #111;
	box-shadow: inner 0 0 10px #111;
	position:relative;
}

ul li label:hover {
	background: #566f82; /* fallback colour */
	background: -webkit-gradient(linear, 0% 0%, 0% 100%, from(#566f82), to(#3e505e));
	background: -webkit-linear-gradient(top, #566f82, #3e505e);
	background: -moz-linear-gradient(top, #566f82, #3e505e);
	background: -ms-linear-gradient(top, #566f82, #3e505e);
	background: -o-linear-gradient(top, #566f82, #3e505e);
}

ul li label:hover span {
	background:#3e505e;
}

ul li input[type='checkbox']:checked ~ label {
	background: #44c6eb; /* fallback colour */
	border-top:1px solid #878e98;
	border-bottom:1px solid #2799db;
	background: -webkit-gradient(linear, 0% 0%, 0% 100%, from(#44c6eb), to(#2799db));
	background: -webkit-linear-gradient(top, #44c6eb, #2799db);
	background: -moz-linear-gradient(top, #44c6eb, #2799db);
	background: -ms-linear-gradient(top, #44c6eb, #2799db);
	background: -o-linear-gradient(top, #44c6eb, #2799db);
}

ul li input[type='checkbox']:checked ~ label span {
	background: #2173a1; /* fallback colour */
	border-top:1px solid #1b5f85;
	border-bottom:1px solid #4cb1e4;
	-moz-box-shadow: inset 0 0 5px #111;
	-webkit-box-shadow: inset 0 0 5px #111;
	box-shadow: inner 0 0 5px #111;
}

ul li input[type='checkbox']:checked ~ .options {
	height: auto;
	display:block;
	min-height:40px;
	max-height:400px;
}

ul ul {
	background:#fff; margin:0; padding:0;
	-moz-box-shadow: inset 0 2px 2px #b3b3b3;
	-webkit-box-shadow: inset 0 2px 2px #b3b3b3;
	box-shadow: inner 0 2px 2px #b3b3b3;
}

ul ul li a {
	display:block;
	padding:6px 12px;
	color:#999;
	text-decoration:none;
}

ul ul li a:hover {
	color:#44c6eb;
}

ul ul li a span {
	color:#999;
	background:none;
	border:1px solid #ccc; 
	-moz-box-shadow: none;
	-webkit-box-shadow: none;
	box-shadow: none;
}

ul ul li {
	border-bottom:1px solid #ccc;
}

ul ul li:first-child {
	padding-top:6px;
}

ul ul li:last-child {
	padding-bottom:6px; border:0;
}

.options {
	height: 0;
	display: block;
	overflow: hidden;
}
	
/* Abridged icomoon font styles
/* (Hosted on Frecosse - Please don't hotlink!)
=============================================== */
@font-face {
	font-family: 'icomoon';
	src:url('http://www.frecosse.com/workshop/accordion_menu/icomoon.eot');
	src:url('http://www.frecosse.com/workshop/accordion_menu/icomoon.eot?#iefix') format('embedded-opentype'),
		url('http://www.frecosse.com/workshop/accordion_menu/icomoon.woff') format('woff'),
		url('http://www.frecosse.com/workshop/accordion_menu/icomoon.ttf') format('truetype'),
		url('http://www.frecosse.com/workshop/accordion_menu/icomoon.svg#icomoon') format('svg');
	font-weight: normal;
	font-style: normal;
}

.icon-music:before, .icon-search:before, .icon-fire:before, .icon-dribbble:before, .icon-flickr:before, .icon-deviantart:before, .icon-picassa:before, .icon-reddit:before, .icon-android:before, .icon-users:before, .icon-film:before, .icon-eye:before, .icon-point-right:before, .icon-microphone:before, .icon-download:before, .icon-warning:before, .icon-images:before, .icon-movie:before, .icon-cloud:before {
	font-family: 'icomoon';
	speak: none;
	font-style: normal;
	font-weight: normal;
	line-height: 1;
	-webkit-font-smoothing: antialiased;
}
.icon-music:before { content: "\61"; }
.icon-search:before { content: "\62"; }
.icon-fire:before { content: "\63"; }
.icon-dribbble:before { content: "\64"; }
.icon-flickr:before { content: "\65"; }
.icon-deviantart:before { content: "\66"; }
.icon-picassa:before { content: "\67"; }
.icon-reddit:before { content: "\68"; }
.icon-android:before { content: "\69"; }
.icon-users:before { content: "\6a"; }
.icon-film:before { content: "\6b"; }
.icon-eye:before { content: "\6c"; }
.icon-point-right:before { content: "\6d"; }
.icon-microphone:before { content: "\6e"; }
.icon-download:before { content: "\6f"; }
.icon-warning:before { content: "\70"; }
.icon-images:before { content: "\71"; }
.icon-movie:before { content: "\72"; }
.icon-cloud:before { content: "\73"; }
              
            
!

JS

              
                
              
            
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999px

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