Accordian using checkbox

HTML

<div class="schools_accordian">
<ul>
<li class="block">
<input type="checkbox" name="item" id="item1" />   
<label for="item1">Friends</label>
<ul class="options">
<li><a href="#">Find New Friends</a></li>
<li><a href="#">Poke A Friend</a></li>
<li><a href="#">Incinerate Existing Friends</a></li>
</ul>
</li>

<li class="block">
<input type="checkbox" name="item" id="item3" />   
<label for="item3">Galleries</label>
<ul class="options">
<li><a href="#">My Deviant Art</a></li>
            <li><a href="#">My Deviant Art</a></li>
            <li><a href="#">My Deviant Art</a></li>
</ul>
</li>
</ul>

</div>


CSS


* {
-webkit-box-sizing: border-box;
-moz-box-sizing: border-box;
box-sizing: border-box;
}
.schools_accordian{
    width: 100%;
}
ul {
list-style:none;
margin:0; 
padding:0;
width:100%;
margin:0 auto;

}

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:100%;
}

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 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 {
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;

}


Live demo jsfiddle