body { font-family: Arial, sans-serif; margin: 0; padding: 0; }
header, footer { background-color: #222; color: white; text-align: center; padding: 10px 0; }
nav a { margin: 0 15px; color: white; text-decoration: none; }
main { padding: 20px; }
section { margin-bottom: 20px; }