<meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <title>HF Demo</title> <style> body { margin: 0; font-family: Arial, sans-serif; } header { background-color: #2c3e50; color: white; text-align: center; padding: 20px; font-size: 28px; font-weight: bold; } </style>

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