This example renders a scalable, smiling face using React components and D3's arc generator for the mouth. The face is drawn with a yellow circle, two eyes, and a curved mouth, all positioned via props passed to a reusable `Face` component. The layout adapts to the browser window, centering the face, while D3's `arc` method creates the mouth path. The SVG output is assembled through composed React components like `BackgroundCircle`, `Eyes`, and `FaceContainer`.