A yellow smiley face rendered as an SVG with React and D3 v7. The face uses a large circle for the head, two white ellipse backgrounds with red and black inner circles for the eyes, and a D3 `arc()` generator to create a mouth path. Positioning is centered via a translated `<g>` group, with all dimensions and offsets defined as constants. The code loads React 16.9 and D3 7.8.5 from CDNs and renders declaratively through `ReactDOM.render`.