next.js/test/integration/font-optimization/fixtures/font-override/pages/_document.js

import * as React from 'react'
import Document, { Main, NextScript, Head, Html } from 'next/document'
export default class MyDocument extends Document {
  render() {
    return (
      <Html>
        <Head>
          <link
            rel="stylesheet"
            href="https://fonts.googleapis.com/css2?family=Roboto&display=swap"
          />
          <link
            rel="stylesheet"
            href="https://fonts.googleapis.com/css2?family=Open+Sans&family=Libre+Baskerville&display=swap"
          />
        </Head>
        <body>
          <Main />
          <NextScript />
        </body>
      </Html>
    )
  }
}