body { font-family: Arial, sans-serif; margin: 20px; background: #f8f9fa; color: #333; }
header, footer { background: #004080; color: #fff; padding: 10px; text-align: center; }
nav a { color: #fff; margin: 0 10px; text-decoration: none; }
main { padding: 20px; background: #fff; border-radius: 5px; }