This example shows a minimal React application that renders the text “Hello React!” in large, centered typography. It demonstrates the basic structure of a React component using the `useState` hook and `ReactDOM.render` to mount the app into a `#root` div. The page loads React and ReactDOM from CDN scripts, and the component is defined in `index.js` with a class name for styling. No data or interaction is present, serving only as a starter template.