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How to use CSS Variables Generator

Add your color, spacing and type tokens, name each variable, and copy the :root custom-property block.

Frequently asked questions

What are CSS custom properties?

Reusable values declared like --primary: #3B82F6 and used with var(--primary), so you change a value in one place.

Why define them on :root?

Declaring variables on :root makes them global, available to every selector across the whole document.

Can CSS variables change at runtime?

Yes — they cascade and can be overridden per selector or updated with JavaScript for theming.

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