This example demonstrates a minimal React application that renders the text "Hello React!" centered on the page. It uses React 16.13.1 and ReactDOM to mount a functional component into the `#root` element, with CSS styling applied via a class selector. The code imports `React` and `ReactDOM` explicitly, calls `ReactDOM.render` to display the component, and relies on a separate bundled JavaScript file. No data visualization or external libraries beyond React are involved.