.back-to-top{position:fixed;right:20px;bottom:20px;z-index:70;box-shadow:0 2px 10px #00000040;opacity:0;visibility:hidden;translate:0 10px}.back-to-top.visible{opacity:1;visibility:visible;translate:0 0}.back-to-top:hover{box-shadow:0 2px 10px #00000040,0 0 3px #9c1006bf}