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How can I automatically switch themes based on the user's dark or light mode preference using CSS?

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How can I automatically switch themes based on the user's dark or light mode preference using CSS?

Asked on Nov 28, 2025

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You can automatically switch themes based on the user's system preference for dark or light mode using CSS media queries. This involves using the `prefers-color-scheme` media feature to apply different styles depending on the user's settings.

<!-- BEGIN COPY / PASTE -->
    <style>
      body {
        background-color: white;
        color: black;
      }

      @media (prefers-color-scheme: dark) {
        body {
          background-color: black;
          color: white;
        }
      }
    </style>
    <!-- END COPY / PASTE -->

Additional Comment:

The `prefers-color-scheme` media feature detects if the user prefers a light or dark color theme.
Define default styles first, then override them within the media query for dark mode.
This approach ensures that your website respects the user's system-wide theme preference.

✅ Answered with CSS best practices.

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How can I automatically switch themes based on the user's dark or light mode preference using CSS?

Asked on Nov 28, 2025

Answer

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