A full-screen yellow smiley face with black outlined eyes is rendered as an SVG, centered within the browser window. The face dynamically scales to the viewport’s dimensions, using the window’s inner height to set the face radius and stroke width. The React application uses `ReactDOM.render` to mount a component that defines the SVG circles for the face and eyes, with coordinates calculated relative to the window’s center. The example demonstrates responsive SVG drawing with React and the React DOM API.