This example demonstrates a minimal React application that renders a static "Hello React!" message in large, centered text. The code uses React and ReactDOM to create a simple functional component and mount it to the DOM, with no data processing or interactive behavior. It relies on the production builds of React 16.13.1 and ReactDOM, loaded via CDN, and includes an incomplete HorizontalBar component definition, though it is not rendered or used. The visualization is purely a text-based output with no charts or graphical elements.