.back-to-top{position:fixed;bottom:.5rem;right:.5rem;width:3rem;height:3rem;border-radius:50%;background-color:rgba(0,0,0,.5);border:2px solid transparent;transition:.16s ease-in-out;opacity:1;cursor:pointer;z-index:100}.back-to-top:focus,.back-to-top:hover{border-color:#78441f}.back-to-top:focus .back-to-top__icon,.back-to-top:hover .back-to-top__icon{fill:#fff}.back-to-top--hidden{opacity:0;pointer-events:none}.back-to-top__icon{position:absolute;top:50%;left:50%;-webkit-transform:translate(-50%,-50%);transform:translate(-50%,-50%);width:2.1875rem;height:2.1875rem;fill:#ccc;transition:.18s ease}