An attempt to import Global CSS from a file other than [`pages/_app.js`](https://nextjs.org/docs/advanced-features/custom-app) was made.
Global CSS cannot be used in files other than your [Custom `<App>`](https://nextjs.org/docs/advanced-features/custom-app) due to its side-effects and ordering problems.
Or, [update your component to use local CSS (Component-Level CSS) via CSS Modules](https://nextjs.org/docs/basic-features/built-in-css-support#adding-component-level-css). This is the preferred approach.
Consider the stylesheet named [`styles.css`](https://nextjs.org/docs/basic-features/built-in-css-support#adding-a-global-stylesheet)
```jsx
//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](https://nextjs.org/docs/advanced-features/custom-app) if not already present. Then [`import`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/import) the [`styles.css` file](https://nextjs.org/docs/basic-features/built-in-css-support#adding-a-global-stylesheet).