body { font-family: Arial, sans-serif; margin: 0; padding: 0; color: #333; }
header, footer { background-color: #004080; color: white; padding: 20px; text-align: center; }
nav { background-color: #003366; padding: 10px; text-align: center; }
nav a { color: white; margin: 0 10px; text-decoration: none; }
main { padding: 20px; }