This example renders a static “Hello React!” message in large, centered text inside a React application. It demonstrates a minimal setup for integrating React with a visualization gallery, using `ReactDOM.render` to mount the `App` component into a `#root` div. The code relies on React 16.13.1’s production UMD builds and a separate `bundle.js` generated from `index.js`. No data sources or interactive behaviors are present; the focus is purely on the starter boilerplate for a React-based visualization project.