.back-to-top{border-radius:var(--border-radius);bottom:4rem;display:grid;font-size:1.8rem;height:6.2rem;opacity:0;padding:1rem;place-content:center;position:fixed;right:4rem;-webkit-transition:opacity .2s ease;transition:opacity .2s ease;width:6.2rem}.back-to-top.is-active{opacity:1}.back-to-top>svg{font-size:0;margin:0 auto}