Fork of Let's make a face: part 3
This example shows a simple smiley face built with SVG shapes, including a gold circular head, two black eyes, and a curved mouth. The face is centered using a transformed group element, with all coordinates relative to the center. The code uses React 17 for component rendering and D3 v7’s `arc` generator to create the mouth path from an inner radius, outer radius, and specified angles. The mouth is drawn as a semicircular arc with a fixed stroke width, while the eyes are placed using offset constants from the center point.