.back-to-top{position:fixed;bottom:0;right:0;z-index:50;opacity:0;transition:.3s opacity ease}.back-to-top .button{width:50px;height:50px;min-width:0;min-height:0;display:flex;align-items:center;justify-content:center;padding:0;border-radius:5px;margin:10px;box-shadow:0 1px 8px #00000040}.back-to-top i{font-size:1.3333333333rem;transform:rotate(180deg)}.back-to-top.visible{opacity:1}