.sac-vsd-backtotop{position:fixed;right:20px;bottom:20px;z-index:99997;width:46px;height:46px;border-radius:50%;border:1px solid #c9c9c9;background:#fff;color:#333;font-size:20px;line-height:1;display:flex;align-items:center;justify-content:center;cursor:pointer;box-shadow:0 3px 10px #0003;opacity:0;visibility:hidden;transform:translateY(8px);transition:opacity .2s,transform .2s,visibility .2s}.sac-vsd-backtotop.is-vsd-visible{opacity:1;visibility:visible;transform:translateY(0)}.sac-vsd-backtotop:hover{background:#efefef}@media (max-width:480px){.sac-vsd-backtotop{right:14px;bottom:14px;width:42px;height:42px;font-size:18px}}