This example renders a yellow smiley face across the full browser window using React and SVG. It centers the face dynamically by calculating the viewport's width and height, drawing a large yellow circle with a black stroke, two black eyes, and leaving the mouth unimplemented. The code uses React 16.9.0 with ReactDOM to create the SVG elements imperatively, relying on window.innerWidth and innerHeight for responsive sizing. The static SVG structure is defined through JSX with explicit circle attributes for position and radius.