body { font-family: Arial, sans-serif; line-height: 1.6; padding: 20px; background-color: #f4f4f4; color: #333; }
header, footer { background: #4CAF50; color: white; padding: 10px 0; text-align: center; }
main { background: white; padding: 20px; border-radius: 8px; }
h1, h2, h3 { margin: 0.5em 0; }