content: import React from 'react';
  import ReactDOM from 'react-dom';
  import { BrowserRouter } from 'react-router-dom';
  import './index.css';
  import App from './App';
  import registerServiceWorker from './registerServiceWorker';
  
  const MainApp = () => (
  <BrowserRouter>
      <App />
    </BrowserRouter>
  )
  
  ReactDOM.render(
    <MainApp />,
    document.getElementById('root')
  );
  registerServiceWorker();
  