dashboard/client/pages/_document.tsx

import React from "react";
import Document, {
  Html,
  Head,
  Main,
  NextScript,
  DocumentContext,
} from "next/document";

import theme from "../src/theme";

export default class MyDocument extends Document {
  render() {
    return (
      <Html lang="en">
        <Head>
          <link
            rel="stylesheet"
            href="https://fonts.googleapis.com/css?family=Roboto:300,400,500,700&display=swap"
          />

          {/* PWA primary color */}
          <meta name="theme-color" content={theme.palette.primary.main} />
        </Head>
        <body>
          <Main />
          <NextScript />
        </body>
      </Html>
    );
  }
}