This example displays a static page with the message “Hello React!” centered in large, bold text. It renders the text using React and ReactDOM, with the `App` component returning a `div` element with the CSS class `message`. The JavaScript constructs the component and mounts it to the `#root` element in the HTML, while the styling defines a font size of 13em with center alignment. React 16.13.1 and ReactDOM 16.13.1 are loaded via external scripts.