This example shows a smiley face composed of a yellow circle, two eyes, and an arc-shaped mouth, all rendered as SVG elements within a React component. The face is centered using SVG group transforms, with size and position controlled by constants for radius, offsets, and stroke width. The code imports React for component structure and d3’s `arc` API to generate the mouth path, while the background circle and eyes are plain SVG `<circle>` elements. The visualization uses d3.v7 and React 16.9, with all geometry defined relative to a central origin for easy scaling.