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html { background: url('bg.png') center center; } #page { box-shadow: #000 0 0 1em; min-height: 90vh; } #menu { text-align: center; } @media(min-width: 100em) { html { background-size: 512px; } } @media(min-width: 200em) { html { background-size: 1024px; } }