text: const panelGroupInstance = (
    <PanelGroup defaultActiveKey="2" accordion>
      <Panel header="Panel 1" eventKey="1">Panel 1 content</Panel>
      <Panel header="Panel 2" eventKey="2">Panel 2 content</Panel>
    </PanelGroup>
  );
  
  ReactDOM.render(panelGroupInstance, mountNode);
  