https://developer.mozilla.org/ja/docs/Web/CSS/@media/prefers-color-scheme
prefers-color-scheme
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media="(prefers-color-scheme: dark)"
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media="(prefers-color-scheme: light)"
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prefers-color-scheme - CSS: カスケーディングスタイルシート | MDN
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@media (prefers-color-scheme: dark)
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