html{height:100%}body{-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;flex-direction:column;min-height:100%;display:flex}.scroll-top{color:#fff;cursor:pointer;opacity:0;visibility:hidden;z-index:9999;background:#000;border-radius:50%;justify-content:center;align-items:center;width:40px;height:40px;transition:all .3s;display:flex;position:fixed;bottom:20px;right:20px}.scroll-top.show{opacity:1;visibility:visible}