This example demonstrates a minimal integration of React and D3, displaying the text "Hello D3 & React" in a large, centered message. The React component uses a `useRef` hook and a `useEffect` to call D3’s `select` function, which directly sets the text content of the referenced DOM element. The application is rendered via `createRoot` from `react-dom/client`, while D3 is imported as a module through an import map.