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<!DOCTYPE html> <html lang="en"> <head> <title>CSS Website Layout</title> <meta charset="utf-8"> <meta name="viewport" content="width=device-width, initial-scale=1"> <style> body { margin: 0; } /* 设置页眉的样式 */ .header { background-color: #f1f1f1; padding: 20px; text-align: center; } </style> </head> <body> <div class="header"> <h1>Header</h1> </div> </body> </html>