This example uses React and ReactDOM to render a simple centered message that reads “Hello React!” at a large font size. The application defines a functional component, `App`, which returns a `div` with the class `message`, styled via CSS to display text at 13em. It relies on React 16.10.0 from unpkg and renders the component into the `#root` element in the HTML. The visualization demonstrates minimal React setup without additional libraries or data processing.