#btl_backtop{
    position: fixed;
    right: 0;
    bottom: 0;
    z-index: 10;
    padding: 20px;
    display: none;
}
#btl_backtop img{
    background: url(../../images/bg_t_black.png) repeat;
    width: 40px;
    height: 40px;
    padding: 10px;
    cursor: pointer;
}

@media (max-width: 1199px) and (min-width: 992px){
}
@media (max-width: 991px) and (min-width: 10px){
    #btl_backtop{
        padding: 5px;
    }
}
@media (max-width: 767px) and (min-width: 10px){
    #btl_backtop img{
        background: url(../../images/bg_t_black.png) repeat;
        width: 30px;
        height: 30px;
        padding: 5px;
        cursor: pointer;
    }
    #btl_backtop{
        padding: 5px;
    }
}
@media (max-width: 499px) and (min-width: 10px){
}