text: import React from 'react';
  import './index.less';
  import OnlineTimeIndicator from './OnlineTimeIndicator';
  import Toolbar from './Toolbar';
  import AddressGrid from './AddressGrid';
  const App = () => {
      return (
          <div className='app'>
              <h1 style={{ textAlign: 'center' }}>Address Book</h1>
              <OnlineTimeIndicator />
              <Toolbar />
              <AddressGrid />
          </div>
      );
  };
  
  export default App;
  