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---
title: CSS Variables
description: Learn how to customize CSS variables in Chakra UI
---
:::info
Please read the [overview](/docs/theming/customization/overview) first to learn
how to properly customize the styling engine, and get type safety.
:::
## Variable Root
Here's an example of how to customize the selector that token CSS variables are
applied to.
```tsx title="theme.ts"
import { createSystem, defaultConfig, defineConfig } from "@chakra-ui/react"
const customConfig = defineConfig({
cssVarsRoot: ":where(html)",
})
export const system = createSystem(defaultConfig, customConfig)
```
The emitted CSS variables will now be applied to the `html` element.
```css
:where(html) {
--chakra-colors-gray-100: #e6f2ff;
--chakra-colors-gray-200: #bfdeff;
--chakra-colors-gray-300: #99caff;
}
```
## Variable Prefix
Here's an example of how to customize the prefix of the emitted CSS variables.
```tsx title="theme.ts"
import { createSystem, defaultConfig, defineConfig } from "@chakra-ui/react"
const customConfig = defineConfig({
cssVarsPrefix: "sui",
})
export const system = createSystem(defaultConfig, customConfig)
```
The emitted CSS variables will now use the `sui` prefix.
```css
:where(html) {
--sui-colors-gray-100: #e6f2ff;
--sui-colors-gray-200: #bfdeff;
--sui-colors-gray-300: #99caff;
}
```
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