.back-top[data-v-53800b10]{position:fixed;bottom:4.0625rem;right:0;width:2.5rem;height:2.5rem;line-height:2.5rem;background-color:#7c7c7c;text-align:center;text-decoration:none;z-index:5;opacity:.7;color:#fff;font-size:2.1875rem;cursor:pointer;transition:all .5s}