вкладки response-bootstrap - содержимое не отображается

//simple tabs.js

import React, {Component} from 'react';
import {Tabs, Tab} from 'react-bootstrap';
import TabItem from './TabItem';
import data from './data'

class SimpleTabs extends Component{

    constructor(props){
        super(props);
        this.state = {
            key: 1 | props.activeKey
        }
        this.handleSelect = this.handleSelect.bind(this);
    }

    handleSelect (key) {
        console.log("selected " + key);
        this.setState({key})
    }
    render(){
        return (
             <Tabs
            activeKey={this.state.key}
            onSelect={this.handleSelect}
            id="controlled-tab-example"
            >
                <Tab eventKey={1} title="Tab 1">
                Tab 1 content
                </Tab>
                <Tab eventKey={2} title="Tab 2">
                Tab 2 content
                </Tab>
                <Tab eventKey={3} title="Tab 3">
                Tab 3 content
                </Tab>
            </Tabs>
        );
    }
}

export default SimpleTabs;

// App.js
import React, { Component } from 'react';
import './App.css';
import 'bootstrap/dist/css/bootstrap.min.css';
import SimpleTabs from './components/SimpleTabs';
import 'bootstrap/dist/js/bootstrap.bundle.min';
import 'bootstrap/dist/css/bootstrap.css'

class App extends Component {
  render() {
    return (
      <SimpleTabs />
    );
  }
}

export default App;