documentation/docs/nextjs/css.md
---
id: css
title: Built-in CSS Support
sidebar_label: Built-in CSS
description: How to use CSS in Next.js?
---
Next.js allows you to import CSS files from a JavaScript file.
For example, to add Global Stylesheet to boilerplate, we import following CSS file within `pages/_app.tsx`.
```css title="src/styles/global.css"
hmtl,
body {
margin: 0;
padding: 0;
font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans",
"Liberation Sans", sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol", "Noto Color Emoji";
}
```
Then, import the styles.css file.
```tsx title="pages/_app.tsx"
import React from "react";
import { AppProps } from "next/app";
import "@styles/global.css";
function MyApp({ Component, pageProps }: AppProps): JSX.Element {
return <Component {...pageProps} />;
}
export default MyApp;
```
These styles will apply to all pages and components in your application.
### CSS Modules
:::caution
next.js only supports CSS Modules as Component-Level CSS implementation.
:::
[CSS Modules](https://github.com/css-modules/css-modules) let you use the same CSS class name in different files without worrying about naming clashes.
To style your components using CSS Modules, name your stylesheet files with the `[name].module.css`.
For example, lets check out a reusable Header component implementation.
```css title="components/header/index.module.css"
.header {
background-color: #20232A;
text-align: center;
}
```
```tsx title="components/header"
import React from "react";
import styles from "./index.module.css";
import { Logo } from "@components";
export const Header: React.FC = () => {
return (
<div className={styles.header}>
<Logo />
</div>
);
};
```
<br/>
:::note
The class names which will be processed into a globally unique class name during build.
:::