.scroll-top-btn{position:fixed;right:16px;bottom:125px;z-index:9999;display:none;width:60px;height:60px;cursor:pointer;opacity:0;transition:opacity .24s;border-radius:60px;overflow:hidden}.scroll-top-btn img{transform:scale(1.1)}.scroll-top-btn.show{display:block;opacity:.8}.scroll-top-btn.show:hover{opacity:1}