A yellow smiley face is rendered as a static SVG. The face consists of a circular background, two eyes, and a mouth, all positioned within an SVG canvas. The code uses React components to structure the drawing, with D3's `arc` API generating the mouth's path. Dimensions and positions for the face features are defined as variables in the main `App` component. The SVG is centered on the canvas, with the background circle radius calculated from the canvas height.