This example displays a minimal React application that renders the text “Hello Reacr” in the browser. It uses React 16.13.1 and ReactDOM to mount a functional component, `App`, into a `#root` div. The page is bundled with JavaScript into `bundle.js`, with global styling applied via CSS to remove margins and hide overflow. The code demonstrates the basic structure for starting a React-based data visualization with a static, text-only output.