fe797c1074
Internal suggestion to remove `en-US` from Mozilla urls since MDN is available in multiple languages nowadays it will automatically redirect to the viewer’s language preference. Closes [DX-2076](https://linear.app/vercel/issue/DX-2076/make-external-mozilla-links-language-agnostic-in-nextjs-docs)
39 lines
1.5 KiB
Text
39 lines
1.5 KiB
Text
---
|
|
title: 'Global CSS Must Be in Your Custom `<App>`'
|
|
---
|
|
|
|
## Why This Error Occurred
|
|
|
|
An attempt to import Global CSS from a file other than [`pages/_app.js`](/docs/pages/building-your-application/routing/custom-app) was made.
|
|
|
|
Global CSS cannot be used in files other than your [Custom `<App>`](/docs/pages/building-your-application/routing/custom-app) due to its side-effects and ordering problems.
|
|
|
|
## Possible Ways to Fix It
|
|
|
|
To avoid conflicts, relocate all first-party Global CSS imports to your [`pages/_app.js` file](/docs/pages/building-your-application/routing/custom-app).
|
|
|
|
Or, [update your component to use local CSS (Component-Level CSS) via CSS Modules](/docs/pages/building-your-application/styling/css-modules). This is the preferred approach.
|
|
|
|
#### Example
|
|
|
|
Consider the stylesheet named [`styles.css`](/docs/pages/building-your-application/styling/css-modules)
|
|
|
|
```css filename="styles.css"
|
|
body {
|
|
font-family: 'SF Pro Text', 'SF Pro Icons', 'Helvetica Neue', 'Helvetica',
|
|
'Arial', sans-serif;
|
|
padding: 20px 20px 60px;
|
|
max-width: 680px;
|
|
margin: 0 auto;
|
|
}
|
|
```
|
|
|
|
Create a [`pages/_app.js` file](/docs/pages/building-your-application/routing/custom-app) if not already present. Then [`import`](https://developer.mozilla.org/docs/Web/JavaScript/Reference/Statements/import) the [`styles.css` file](/docs/pages/building-your-application/styling/css-modules).
|
|
|
|
```jsx filename="pages/_app.js"
|
|
import '../styles.css'
|
|
|
|
export default function MyApp({ Component, pageProps }) {
|
|
return <Component {...pageProps} />
|
|
}
|
|
```
|