Gadget:backToTop.css

.mw-mmv-lightbox-open .backToTop{display:none!important}
.backToTop {
    display:none;
    width:71px;
    height:54px;
    color:#fff;
    position:fixed;
    right:0;
    bottom:100px;
    cursor:pointer;
    opacity:.6;
    z-index:73;
    background:url(//static.mcbbs.net/template/mcbbs/image/scrollTo.png)
}