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<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;}/* Style the header */.header { background-color: #f1f1f1; padding: 20px; text-align: center;}</style></head><body><div class="header"> <h1>Header</h1></div></body></html>