@media (min-width: 320px) and (max-width: 767px) {
    #back-top {
        bottom: -110px !important;
        right: -287px !important;
        position: relative;
        top: 462px;
    }
    #back-top a{
        width: 195px !important;
        height: 62px !important;
        padding: 27px 0 10px 4px !important;
        background-position: 68px 17px !important;
        background-size: 30px !important;
    }
}