_app.js

import React from 'react';
import App, { Container } from 'next/app';
import OfflineSupport from '../components/OfflineSupport';
class CustomApp extends App {
 render() {
  const { Component, pageProps } = this.props;
  return (
   <Container>
    <OfflineSupport />
    <Component {...pageProps} />
   </Container>
  );
 }
}
export default CustomApp;