:root{color-scheme:dark;font-family:system-ui,sans-serif;background:#111827;color:#f9fafb}body{margin:0;display:grid;min-height:100vh;place-items:center}main{max-width:36rem;padding:2rem;border:1px solid #374151;border-radius:1rem;background:#1f2937}h1{margin-top:0}