:root { font-size: 10px; color: #263238; background: #f8fafb; font-family: Arial, sans-serif; }
* { box-sizing: border-box; }
body { margin: 0; font-size: 1.6rem; }
main { max-width: 72rem; margin: 8rem auto; padding: 3rem; background: #fff; border-radius: 1.2rem; box-shadow: 0 1rem 3rem rgb(38 50 56 / 8%); }
h1 { margin-top: 0; }