This example shows a minimal React application that renders a static “Hello React!” message centered on the page. It demonstrates the basic setup for using React with a bundler, with the message styled using CSS at a large font size. The code imports React and ReactDOM, defines a simple functional component, and mounts it to the DOM via `ReactDOM.render`. The page loads React and React-DOM from unpkg CDN links and executes the bundled JavaScript from `bundle.js`.