div#demo {
	margin: 50px auto 50px auto;
	text-align: center;
}

div#demo ul#menu {
    margin: 5px 0px;
    list-style: none;
    display: inline-block;
}
    
div#demo ul#menu li {
    padding: 0px;
    float: left;
    position: relative;
    margin-left: 5px;
    margin-right: 5px;
    width: 48px;
    height: 48px;
}

div#demo ul#menu li a {
    position: absolute;
}

div#demo ul#menu li img {
    position: absolute;
    width: 48px;
    top: 0px;
    left: 0px;
    padding: 0px;
    margin: 0 8px 0 0;
    border: none;
    overflow: hidden;
}