body { font-family: Arial, sans-serif; margin: 0; padding: 0; }
header { background: #f8f9fa; padding: 1em; text-align: center; }
nav a { margin: 0 10px; text-decoration: none; color: #333; }
main { padding: 2em; }
footer { background: #f1f1f1; text-align: center; padding: 1em; }