A smiling face rendered as a yellow circle with black outlines, two eyes, and an arc-shaped mouth. The visualization is built with React and D3 v5, using SVG elements inside a single `<g>` transform. A `BackgourndCircle` component draws the face via a `<circle>`, while the mouth is generated with `d3.arc()` using start and end angles. Eye positions and radii are fixed constants, demonstrating declarative React components combined with D3’s arc generator for path creation.