This example shows a minimal React application that renders the text “Hello React!” centered on the page. The code uses React and ReactDOM to define an `App` component and mount it into the `#root` element. Styling is applied via CSS, setting the message’s font size to 13em and centering it with text alignment. The page loads React from a CDN and executes the compiled bundle, demonstrating a basic component-rendering workflow without additional data or interactivity.