This example demonstrates a minimal React application that renders a large, centered “Hello React!” message on a plain white page. The code uses React’s `ReactDOM.render` method to mount a functional component into a `div` with the ID `root`. The component returns a simple `<div>` with a CSS class that sets the font size to 13em. No data visualization or interactive behavior is present; it serves as a starting template for integrating React with other libraries.