body { font-family: sans-serif; background: #fafafa; color: #222; margin: 0; }
header { background: #2c3e50; color: #fff; padding: 16px 24px; }
main { max-width: 720px; margin: 32px auto; padding: 16px 24px; background: #fff; border-radius: 6px; }
footer { text-align: center; color: #888; padding: 16px; font-size: 12px; }