Happy faces
A smiling face rendered as an SVG using React and D3. The face has a radial-gradient yellow-to-orange background circle, two eyes with white highlights and grey gradients, and a curved mouth drawn with a D3 arc path. The components are separate React exports (`BackgroundCircle`, `Eyes`, `Mouth`) combined in an app, with the face centered via a transform. All shapes are positioned using fixed numeric constants for offsets and radii, and the SVG is rendered into the DOM via `ReactDOM.render`.