content: import React, { Component } from 'react';
  import { render } from 'react-dom';
  import { 
    BrowserRouter
  } from 'react-router-dom';
  import App from './App';
  
  class Main extends Component {
    render() {
      return (
        <BrowserRouter>
          <App />
        </BrowserRouter>
      );
    }
  }
  
  render(<Main />, document.getElementById('root'));
  