This example shows a yellow smiley face rendered as a scalable vector graphic, with the face centered and sized to fill the browser window. The code uses React’s `ReactDOM.render` to mount an SVG component that draws circles for the head, eyes, and mouth area. The face positions and radii are computed from `window.innerWidth` and `window.innerHeight`, with the head’s radius derived from the viewport height. The SVG uses a `<g>` transform to center the drawing, and the face is missing its mouth, leaving an unfinished expression.