44d1a1cb15
This PR is part of a larger effort to migrate error messages to MDX and use App Router: https://github.com/vercel/front/pull/23459
39 lines
1.5 KiB
Text
39 lines
1.5 KiB
Text
---
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title: 'Global CSS Must Be in Your Custom `<App>`'
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---
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## Why This Error Occurred
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An attempt to import Global CSS from a file other than [`pages/_app.js`](/docs/pages/building-your-application/routing/custom-app) was made.
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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.
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## Possible Ways to Fix It
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To avoid conflicts, relocate all first-party Global CSS imports to your [`pages/_app.js` file](/docs/pages/building-your-application/routing/custom-app).
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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.
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#### Example
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Consider the stylesheet named [`styles.css`](/docs/pages/building-your-application/styling/css-modules)
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```css filename="styles.css"
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body {
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font-family: 'SF Pro Text', 'SF Pro Icons', 'Helvetica Neue', 'Helvetica',
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'Arial', sans-serif;
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padding: 20px 20px 60px;
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max-width: 680px;
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margin: 0 auto;
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}
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```
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Create a [`pages/_app.js` file](/docs/pages/building-your-application/routing/custom-app) if not already present. Then [`import`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/import) the [`styles.css` file](/docs/pages/building-your-application/styling/css-modules).
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```jsx filename="pages/_app.js"
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import '../styles.css'
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export default function MyApp({ Component, pageProps }) {
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return <Component {...pageProps} />
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}
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```
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