This example shows a yellow smiley face rendered as an SVG that scales to fill the browser window. A React component uses JSX to draw three circles: a large face with a black stroke, and two smaller eyes positioned symmetrically around the center. The code relies on React’s `ReactDOM.render` to mount the component, with dimensions derived from `window.innerWidth` and `window.innerHeight`. All positioning is handled through SVG `circle` elements and a `g` transform, using plain numeric constants for offsets and radii.