pages/_document.tsx

import Document, { Html, Head, Main, NextScript } from 'next/document'

class MyDocument extends Document {
  render() {
    return (
      <Html lang="en">
        <Head>
          <link rel="preconnect" href="https://fonts.googleapis.com" />
          <link
            rel="preconnect"
            href="https://fonts.gstatic.com"
            crossOrigin="true"
          ></link>
          <link
            href="https://fonts.googleapis.com/css2?family=Poppins:ital,wght@0,100;0,300;0,400;0,500;0,600;1,100;1,300;1,400;1,500;1,600&display=swap"
            rel="stylesheet"
          ></link>
        </Head>
        <body>
          <Main />
          <NextScript />
        </body>
      </Html>
    )
  }
}

export default MyDocument