.back-to-top{position:fixed;bottom:20px;right:20px;z-index:1000;cursor:pointer;color:white;border:none;border-radius:50%;padding:15px 20px;font-size:1.5rem;line-height:1;opacity:0;visibility:hidden;transition:opacity .3s ease,visibility .3s ease}.back-to-top.show{opacity:1;visibility:visible;border:thin solid white;margin:0 20px 40px 0}