This example shows a large yellow smiley face drawn as a scaled SVG that fills the browser window. The face adapts to the viewport size by calculating its center and radius from `window.innerWidth` and `window.innerHeight`. Using React and ReactDOM, the code defines static circle elements for the face, eyes, and mouth within an SVG container, with positioning handled by a `g` transform and attributes like `eyeOffsetX` and `mouthRadius`. The rendering relies entirely on SVG primitives, with no interaction or animation.