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What's the best way to implement dark mode using CSS variables?

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What's the best way to implement dark mode using CSS variables?

Asked on May 07, 2026

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Implementing dark mode using CSS variables is an efficient and scalable approach that allows for easy theme switching. By defining color variables in the `:root` selector and toggling them with a class, you can seamlessly switch between light and dark themes.

<!-- BEGIN COPY / PASTE -->
    :root {
      --background-color: #ffffff;
      --text-color: #000000;
    }

    .dark-mode {
      --background-color: #000000;
      --text-color: #ffffff;
    }

    body {
      background-color: var(--background-color);
      color: var(--text-color);
    }

    /* JavaScript to toggle dark mode */
    document.querySelector('#toggle-dark-mode').addEventListener('click', () => {
      document.body.classList.toggle('dark-mode');
    });
    <!-- END COPY / PASTE -->

Additional Comment:

CSS variables (custom properties) allow for dynamic theming by changing variable values.
Ensure that the toggle button (e.g., with id `toggle-dark-mode`) is present in your HTML.
Consider storing the user's theme preference in `localStorage` for persistence across sessions.
Test the color contrast to maintain accessibility standards in both themes.

✅ Answered with Web Development best practices.

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What's the best way to implement dark mode using CSS variables?

Asked on May 07, 2026

Answer

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