This example shows a single red heading that reads “Hello Neenu,” rendered at a very large scale using React. The code imports React and ReactDOM, defines an `App` component with a `styles` object setting the font size and color, and then calls `ReactDOM.render` to mount the component into the `#root` div. It relies on the UMD builds of React 16.13.1 and ReactDOM, loaded from unpkg, with the browser displaying the output in the `index.html` file.