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CSS Dark Mode Generator

Generate CSS custom properties and a JavaScript toggle for a complete light/dark mode theme system.

Preset: TAILWINDColors Used: 12CSS Size: 707 BJS Size: 684 B
Select Preset System

Light Mode

Dark Mode

CSS theme updated

How CSS custom properties enable dark mode

CSS custom properties (variables) are the cleanest approach to dark mode — define all colors once in :root and override them in a [data-theme="dark"] selector. The prefers-color-scheme media query auto-applies dark colors for system-preference users, while the localStorage-backed JS toggle respects explicit user overrides.

Private & free — this tool runs entirely in your browser.

KinstaFast managed hosting — up to $500 + 10% recurring.affiliate

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