text: import React, { Component } from 'react';
  import ReactDOM from 'react-dom';
  import BookList from '../containers/book-list';
  import ActiveBook from '../containers/book-detail';
  
  export default class App extends Component {
    render() {
      return (
        <div>
          <BookList />
          <ActiveBook/>
        </div>
      );  
    }
  }
  