.baack-to-top-button{background:#263238;display:block;width:50px;height:50px;box-shadow:0 0 10px 0 rgba(38,50,56,.5);border-radius:50%;transition:all .25s ease-in-out,bottom .7s ease-in-out;opacity:.3;color:#fff;font-size:2rem;line-height:48px;text-align:center;text-decoration:none;cursor:pointer;position:fixed;right:2rem;bottom:-200px;z-index:800}.baack-to-top-button.active{bottom:38px}.baack-to-top-button:hover{background:#263238;opacity:1}