content: import React from 'react';
  import ReactDOM from 'react-dom';
  
  import Toolbar from '../toolbar/Toolbar';
  import FootToolbar from '../foot_toolbar/FootToolbar';
  import MainView from './ViewContainer';
  
  class App extends React.Component {
    constructor(props) {
      super(props);
  
      this.toolBarHeight = 50;
      this.footerHeight = 50;
    }
  
    render() {
      return (
        <div>
          <Toolbar toolBarHeight={this.toolBarHeight}/>
          <MainView />
          <FootToolbar footerHeight={this.footerHeight}/>
        </div>
      );
    }
  }
  
  ReactDOM.render(
      <App />,
      document.getElementById('content')
  );
  