.back-to-top{position:fixed;z-index:15;bottom:3rem;right:2rem;width:6rem;height:6rem;display:flex;flex-direction:column;align-items:center;justify-content:center;background:var(--color__white);color:var(--color__black);box-shadow:0 10px 20px 0 rgba(0,0,0,.1);border:none;cursor:pointer;opacity:0;visibility:hidden;pointer-events:none;transition:opacity .3s ease,transform .3s ease;transform:translateY(10px)}.back-to-top.is-visible{opacity:1;visibility:visible;pointer-events:auto;transform:translateY(0)}.back-to-top i{line-height:1.2}.back-to-top span{font-size:1.4rem;text-transform:uppercase;letter-spacing:.5rem}