body { font-family: Arial, sans-serif; margin: 0; padding: 0; background: #f9f9f9; }
header { background: #4CAF50; padding: 15px; color: white; text-align: center; }
nav a { color: white; margin: 0 10px; text-decoration: none; font-weight: bold; }
nav a:hover { text-decoration: underline; }
main { padding: 20px; background: white; margin: 20px; border-radius: 8px; box-shadow: 0 2px 5px rgba(0,0,0,0.1); }
footer { text-align: center; padding: 10px; background: #333; color: white; margin-top: 20px; }