drenther/_app.js

## _app.js
import React from 'react';
import App, { Container } from 'next/app';

import Header from '../components/Header';
import OfflineSupport from '../components/OfflineSupport';

class CustomApp extends App {
  render() {
    const { Component, pageProps } = this.props;
    return (
      <Container>
        <Header />
        <OfflineSupport />
        <Component {...pageProps} />
      </Container>
    );
  }
}

export default CustomApp;

## _document.js
import Document, { Head, Main, NextScript } from 'next/document';

export default class CustomDocument extends Document {
  render() {
    return (
      <html lang="en">
        <Head />
        <body>
          <Main />
          <NextScript />
        </body>
      </html>
    );
  }
}
	import React from 'react';
	import App, { Container } from 'next/app';

	import Header from '../components/Header';
	import OfflineSupport from '../components/OfflineSupport';

	class CustomApp extends App {
	render() {
	const { Component, pageProps } = this.props;
	return (
	<Container>
	<Header />
	<OfflineSupport />
	<Component {...pageProps} />
	</Container>
	);
	}
	}

	export default CustomApp;
	import Document, { Head, Main, NextScript } from 'next/document';

	export default class CustomDocument extends Document {
	render() {
	return (
	<html lang="en">
	<Head />
	<body>
	<Main />
	<NextScript />
	</body>
	</html>
	);
	}
	}