#scroll-to-top-btn{z-index:100;background:var(--light);width:40px;height:40px;color:var(--dark);border:1px solid var(--lightgray);cursor:pointer;opacity:0;visibility:hidden;border-radius:6px;justify-content:center;align-items:center;transition:opacity .2s,visibility .2s,background .2s,color .2s;display:flex;position:fixed;bottom:1.5rem;right:1.5rem}#scroll-to-top-btn.visible{opacity:1;visibility:visible}#scroll-to-top-btn:hover{background:var(--lightgray);color:var(--secondary)}#scroll-to-top-btn svg{width:20px;height:20px}