label {
    color: #fff;
    padding: 10px;
    display: block;
    margin: 0;
    border: 1px solid #fff;
}

input[type="checkbox"].on-off{
    display: none;
}
.menu ul {
    -webkit-transition: all 0.5s;
    -moz-transition: all 0.5s;
    -ms-transition: all 0.5s;
    -o-transition: all 0.5s;
    transition: all 0.5s;
    margin: 0;
    padding: 0;
    list-style: none;
}

.menu li {
    padding: 5px;
}

input[type="checkbox"].on-off + ul{
    height: 0;
    overflow: hidden;
}
input[type="checkbox"].on-off:checked + ul{
    height: 550px;
}
label { background: -moz-linear-gradient(top, #C6F0FE, #27BCF9); background: -webkit-gradient(linear, left top, left bottom, from(#C6F0FE), to(#27BCF9));
/* IE5.5-7 */  
filter: progid:  
DXImageTransform.Microsoft.gradient(  
startColorstr='#C6F0FE', endColorstr='#27BCF9', GradientType=1);
 
/* IE8-9 */  
-ms-filter: "progid:DXImageTransform.Microsoft.gradient(startColorstr='#C6F0FE', endColorstr='#27BCF9', GradientType=0)";
 
/* IE10 */  
background: -ms-linear-gradient(left,  #C6F0FE,  #27BCF9);
}
div.menu {
margin-top:50px;
}