.UIBackTopTopControl {
        background: rgba(0, 0, 0, 0) url("images/top.png") no-repeat scroll center center;
        bottom: 170px;
        height: 40px;
        position: fixed;
        right: 50px;
        width: 40px;
        z-index: 10;
        border-radius: 5px;
}
@media only screen and (max-width: 768px){
        .UIBackTopTopControl {
                right: 15px;
        }
}