This example demonstrates a minimal React application that renders the text “Hello React!” inside a full-screen viewport. It uses React 16.7.0 and ReactDOM to mount the component into a root `<div>`, with plain inline styling to remove default margins and hide overflow. The code imports the `react` and `react-dom` libraries, defines a simple functional component, and calls `ReactDOM.render` to attach it to the DOM. No data visualization or external data source is involved; the purpose is to provide a clean starting point for building more complex React-based visualizations.