This example demonstrates a minimal React application that renders the text “Hello React!” in large, centered type. It shows how React manages a single root DOM element, displaying a static message without any interactive or data-driven behavior. The code imports React and ReactDOM, defines a functional `App` component, and mounts it to the `#root` div using `ReactDOM.render`. It relies on the React 16.13.1 production build loaded via CDN, with styling applied through a CSS class in the HTML file.