A smiling face rendered as a static SVG graphic. The face comprises a yellow circular background with a black outline, two black eyes, and a black arc-shaped mouth. Built with React and D3, the example uses D3's `arc()` API to generate the mouth path, while the face’s components are composed as reusable React components (`BackgroundCircle`, `Eyes`, `Mouth`). The SVG canvas is 960 by 500 pixels, with the face centered via a transform translation.