*{box-sizing:border-box;margin:0;padding:0}body{font-family:system-ui,-apple-system,sans-serif;line-height:1.5;color:#333;background:#f9f9f9;padding:2rem}#root{max-width:600px;margin:0 auto;text-align:center}h1{margin-bottom:1rem;color:#2563eb}button{padding:.5rem 1rem;background:#2563eb;color:#fff;border:none;border-radius:.375rem;cursor:pointer;font-size:1rem}button:hover{background:#1d4ed8}