body { font-family: Arial, sans-serif; margin: 0; padding: 0; background: #fff; color: #111; }
header { background: red; color: white; text-align: center; padding: 20px; }
main { padding: 20px; }
footer { background: #f0f0f0; text-align: center; padding: 10px; font-size: 0.9em; }