This example demonstrates a minimal React application that renders a simple “Hello React” message. It uses React 16.9.0 and ReactDOM to mount a functional component into a root `<div>` element. The page is styled with CSS that removes margins and hides overflow, though the accompanying SVG markup for a smiley face (with yellow circle, eyes, and stroke) is present only as a commented-out template. The code imports React and ReactDOM directly and calls `ReactDOM.render` to display the component, serving as a basic starter for embedding visualizations within a React framework.