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No `styled-jsx` in `_document`

Prevent usage of styled-jsx in pages/_document.js.

Why This Error Occurred​

Custom CSS like styled-jsx is not allowed in a Custom Document.

Possible Ways to Fix It​

If you need shared CSS for all of your pages, take a look at the Custom App file or define a custom layout.

For example, consider the following stylesheet named 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,tsx} file if not already present. Then, import the styles.css file.

import '../styles.css'

// This default export is required in a new `pages/_app.js` file.
export default function MyApp({ Component, pageProps }) {
  return <Component {...pageProps} />
}

These styles (styles.css) will apply to all pages and components in your application.