spend-ia/packages/client/pages/_document.tsx

import React from 'react';
import Document, { type DocumentContext } from 'next/document';
import { ServerStyleSheet } from 'styled-components';

export default class MyDocument extends Document {
  static async getInitialProps(ctx: DocumentContext): Promise<any> {
    const sheet = new ServerStyleSheet();
    const originalRenderPage = ctx.renderPage;

    try {
      ctx.renderPage = async () =>
        await originalRenderPage({
          enhanceApp: (App) => (props) => sheet.collectStyles(<App {...props} />),
        });

      const initialProps = await Document.getInitialProps(ctx);
      return {
        ...initialProps,
        styles: [initialProps.styles, sheet.getStyleElement()],
      };
    } finally {
      sheet.seal();
    }
  }
}