This example demonstrates a minimal React application that renders the text “Hello React!” in large, centered type using a 13em font size. The code imports React and `createRoot` from `react-dom/client` to mount a functional `App` component into a `#root` div. An import map in the HTML loads React 19.1.0 and its JSX runtime from a CDN. The styling is applied via a CSS class, and the rendering approach uses standard JSX syntax without additional data sources or libraries.