This example renders a blank React application inside an HTML page, demonstrating the minimal setup required to combine React with D3. The code loads React 18, ReactDOM, and D3 v7 from CDNs, then uses `ReactDOM.render` to mount a simple `App` component into a `root` div. The page defines a hidden overflow body style and includes a YouTube video embed in the README, though the visible output only shows an empty canvas. The focus is on the wiring of the JavaScript libraries rather than any data visualization.