This example displays the text “React!” centered on the page in large, bold type. The code demonstrates a minimal React application by using the `ReactDOM.render` method to inject a simple component into the DOM. It relies on the React and ReactDOM libraries from unpkg, with the component defined as a constant arrow function that returns a div element. The styling is handled by a CSS class that sets the font size and centers the text horizontally, providing a straightforward illustration of React’s rendering capabilities.