body { font-family: Arial, sans-serif; margin: 0; padding: 20px; background: #f5f5f5; }
.container { max-width: 800px; margin: 0 auto; background: white; padding: 20px; border-radius: 8px; }
.error { color: red; padding: 10px; background: #fff0f0; border-radius: 4px; }
pre { background: #f5f5f5; padding: 10px; border-radius: 4px; overflow-x: auto; }