old_contents: import React, { Component } from 'react';
  import './assets/sass/App.sass';
  
  import LandingScreen from './components/LandingScreen'
  
  class App extends Component {
    render() {
      return (
        <div className="App">
          <LandingScreen />
        </div>
      );
    }
  }
  
  export default App;
  
new_contents: import React, { Component } from 'react';
  import './assets/sass/App.sass';
  
  import LandingScreen from './components/LandingScreen'
  import MainContent from './components/MainContent'
  
  class App extends Component {
    render() {
      return (
        <div className="App">
          <LandingScreen />
          <MainContent />
        </div>
      );
    }
  }
  
  export default App;
  
subject: rename components