This example displays a single, large “Hello React!” message centered on the page. It demonstrates the minimal setup for integrating React with a visualization environment by rendering a static text element. The code uses React 16.10 and ReactDOM to mount a functional component into the DOM, with the `index.html` file linking to UMD builds of React and ReactDOM. Styling for the message is defined in a CSS rule, while the component itself is plain JSX with no data or interaction logic.