This example draws a classic yellow smiley face centered in an SVG canvas using React. It shows the face’s head, two eyes, and a curved mouth, all positioned relative to the canvas center. The code uses React to render SVG elements and D3’s `arc` generator to create the mouth path. The head is a yellow circle with a black stroke, while the eyes are plain black circles offset horizontally and vertically from the center. The mouth is formed by an arc with inner and outer radii and half-circle start and end angles.