A yellow smiley face is drawn using React and rendered as SVG, with its circular head and facial features positioned relative to the window dimensions. The face is centered on screen using a translated `<g>` group, and circles are used for the head, eyes, and mouth. The code uses React 16.9.0 with `ReactDOM.render` to inject the SVG into the DOM, and all shapes are defined with SVG circle elements. The example demonstrates responsive sizing by deriving coordinates from `window.innerWidth` and `window.innerHeight`.