div#scroll2Top a{
    display:none;
    background:url('img/scroll2top.png');
    width:40px;
    height:40px;
    position:fixed;
    bottom:30px;
    right:30px;
    border-radius:10px;
    opacity:0.2;
}
div#scroll2Top a:hover{
    opacity:0.8;
}