A yellow smiley face is drawn as a circle with two eyes, centered within a square SVG viewport. The face uses React components to render three SVG circle elements, with the main face outlined in black and the eyes filled with the default black color. The code imports React and ReactDOM, mounts the component to a root div, and relies on React’s production build from a CDN. Eye positions are calculated using offsets from the center, and the face radius is derived from the viewport height.