content: import React from 'react';
  import ReactDOM from 'react-dom';
  import NavBar from './components/NavBar';
  import Page from './components/Page';
  
  class App extends React.Component {
    render() {
      return (
        <div id="content">
          <NavBar userName="Sai" />
          <Page>
            <h1>
              Hello World!
            </h1>
          </Page>
        </div>
      );
    }
  }
  
  ReactDOM.render(<App />, document.querySelector("#app"));
  