This example shows a yellow smiley face rendered as a scalable vector graphic that fills the browser window. The face uses React components to draw a yellow circle with a black stroke for the head, two black eyes, and a blank space where a mouth would be. The code leverages React 16.9 and ReactDOM to render SVG elements into a root div, with dimensions derived from `window.innerWidth` and `window.innerHeight`. The graphic positions all elements relative to the viewport center using a transformation group and hardcoded offset constants.