back-to-top{align-items:center;border-radius:100%;box-shadow:0 5px 15px rgba(0,0,0,.35);cursor:pointer;display:flex;justify-content:center;opacity:0;padding:1.5rem;position:fixed;transition:opacity .3s ease,visibility .3s ease;visibility:hidden;z-index:1}back-to-top.visible{opacity:1;transition:all .3s ease;visibility:visible}back-to-top .svg-wrapper{transform:rotate(180deg)}