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  body { font-family: Arial, sans-serif; margin: 20px; background-color: #f4f4f4; color: #333; } .container { background-color: #fff; padding: 20px; border-radius: 8px; box-shadow: 0 0 10px rgba(0,0,0,0.1); } h1 { color: #2c3e50;...