Fork of Smiley Face Part III
A smiley face built with React and D3 renders centered on an SVG canvas. The code uses D3's `arc` generator to create the mouth path, while the face, eyes, and stroke are plain SVG circles with explicit radius and offset values. The React component computes dimensions and positions using constants for center coordinates, eye placement, and radii. The visualization demonstrates a static composition, with the face’s yellow fill and black stroke defined inline, and the entire graphic centered within a 960×500 viewport.