This example shows a simple yellow smiley face built from three SVG circles, all rendered inside a React component. The face is centered within a 960 by 500 pixel viewport, with the head outlined in black and two smaller circles serving as eyes. The code uses React’s `ReactDOM.render` to mount an `<App>` component that directly returns an `<svg>` element with hardcoded `cx`, `cy`, and `r` values derived from the viewport dimensions. Rendering relies on the browser’s native SVG support, and no external data sources or interaction logic are present.