A yellow smiley face with black-outlined eyes fills the browser window, centered via a React component that computes dimensions from `window.innerWidth` and `window.innerHeight`. The SVG face scales its radius relative to viewport height, with eye positions offset by fixed pixel values. React 16.9 renders the circles declaratively, using a `<g>` transform to place the face at the viewport’s midpoint. The empty mouth is omitted from the final render despite commented-out placeholder markup.