.app{max-width:720px;margin:3rem auto;padding:1.5rem;border:1px solid #e5e7eb;border-radius:12px;background:#fff;font-family:ui-sans-serif,system-ui,-apple-system,sans-serif}h1{margin:0 0 .5rem;font-size:1.5rem}p{margin:.35rem 0}*{box-sizing:border-box}body{margin:0;background:#f6f7f9;color:#111827}