What is dark mode?
Dark mode is an alternate color scheme using dark backgrounds and light text. Reduces eye strain, saves battery on OLED, and users expect it in 2026.
Definition
Dark mode is an alternative color scheme that uses dark backgrounds with light-colored text and UI elements, as opposed to the traditional light backgrounds with dark text.
How it works
Implementing dark mode properly isn't just inverting colors. You need separate color scales for light and dark contexts, adjusted contrast ratios (dark backgrounds need lighter text than you think), and careful handling of shadows (shadows barely work on dark backgrounds — use lighter borders or glows instead). The cleanest approach: CSS variables that swap on a `data-theme` attribute or `prefers-color-scheme` media query.
Why it matters
In 2026, shipping without dark mode is like shipping without mobile responsiveness in 2016. Over 80% of users prefer dark mode in at least some contexts. It's not optional anymore. And it's a significant engineering effort if you don't plan for it from the start — which is why baking it into your brand system from day one saves weeks of refactoring later.
Example
With CSS variables: define light values on `:root`, dark values on `[data-theme='dark']`. With Tailwind: use the `dark:` variant. With tokens: define `color.primary.light` and `color.primary.dark` in your tokens.json and generate both themes automatically.
Related terms
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