#scroll {
    width:50px;
    height:50px;
    bottom:49px;
    position:fixed;
    background-color:#cfcfcf;
    border-radius:60px;
    right:25px;
    cursor:pointer;
    z-index: 10000;
}
#scroll span {
    width:0;
    height:0;
    top:50%;
    position:absolute;
    margin-top:-12px;
    margin-left:-8px;
    left:50%;
    border:8px solid transparent;
    border-bottom-color:#ffffff;
    z-index:10000;
}
#scroll:hover {
    background-color:#628bc4;
    opacity:1;
    filter:"alpha(opacity=100)";
    -ms-filter:"alpha(opacity=100)";
    z-index:10000;
}