This example demonstrates a minimal React application that renders the text “Hello React!” centered on a web page. The code defines a functional component that returns a styled message, then uses ReactDOM’s `render` method to mount it into the root div. It imports React and ReactDOM directly, with the latter supplied through the `react-dom` package, and loads the production builds of both libraries from unpkg. No data source is involved; the element’s appearance is controlled by the `.message` CSS class, which sets a large font size and text alignment.