next.js/docs/01-app/02-guides/sass.mdx

---
title: How to use Sass
nav_title: Sass
description: Style your Next.js application using Sass.
---

{/* The content of this doc is shared between the app and pages router. You can use the `<PagesOnly>Content</PagesOnly>` component to add content that is specific to the Pages Router. Any shared content should not be wrapped in a component. */}

Next.js has built-in support for integrating with Sass after the package is installed using both the `.scss` and `.sass` extensions. You can use component-level Sass via CSS Modules and the `.module.scss`or `.module.sass` extension.

First, install [`sass`](https://github.com/sass/sass):

```bash filename="Terminal"
npm install --save-dev sass
```

> **Good to know**:
>
> Sass supports [two different syntaxes](https://sass-lang.com/documentation/syntax), each with their own extension.
> The `.scss` extension requires you use the [SCSS syntax](https://sass-lang.com/documentation/syntax#scss),
> while the `.sass` extension requires you use the [Indented Syntax ("Sass")](https://sass-lang.com/documentation/syntax#the-indented-syntax).
>
> If you're not sure which to choose, start with the `.scss` extension which is a superset of CSS, and doesn't require you learn the
> Indented Syntax ("Sass").

### Customizing Sass Options

If you want to configure your Sass options, use `sassOptions` in `next.config`.

```ts filename="next.config.ts" switcher
import type { NextConfig } from 'next'

const nextConfig: NextConfig = {
  sassOptions: {
    additionalData: `$var: red;`,
  },
}

export default nextConfig
```

```js filename="next.config.js" switcher
/** @type {import('next').NextConfig} */

const nextConfig = {
  sassOptions: {
    additionalData: `$var: red;`,
  },
}

module.exports = nextConfig
```

#### Implementation

You can use the `implementation` property to specify the Sass implementation to use. By default, Next.js uses the [`sass`](https://www.npmjs.com/package/sass) package.

```ts filename="next.config.ts" switcher
import type { NextConfig } from 'next'

const nextConfig: NextConfig = {
  sassOptions: {
    implementation: 'sass-embedded',
  },
}

export default nextConfig
```

```js filename="next.config.js" switcher
/** @type {import('next').NextConfig} */

const nextConfig = {
  sassOptions: {
    implementation: 'sass-embedded',
  },
}

module.exports = nextConfig
```

### Sass Variables

Next.js supports Sass variables exported from CSS Module files.

For example, using the exported `primaryColor` Sass variable:

```scss filename="app/variables.module.scss"
$primary-color: #64ff00;

:export {
  primaryColor: $primary-color;
}
```

<AppOnly>

```jsx filename="app/page.js"
// maps to root `/` URL

import variables from './variables.module.scss'

export default function Page() {
  return <h1 style={{ color: variables.primaryColor }}>Hello, Next.js!</h1>
}
```

</AppOnly>

<PagesOnly>

```jsx filename="pages/_app.js"
import variables from '../styles/variables.module.scss'

export default function MyApp({ Component, pageProps }) {
  return (
    <Layout color={variables.primaryColor}>
      <Component {...pageProps} />
    </Layout>
  )
}
```

</PagesOnly>