body { font-family: Arial, sans-serif; margin: 0; padding: 0; background: #f4f4f4; color: #333; } header, footer { background: #222; color: #fff; text-align: center; padding: 1em; } nav { text-align: center; background: #444; padding: 0.5em; } nav a { color: white; margin: 0 1em; text-decoration: none; }