A yellow smiley face fills the browser window, with two black eyes and a yellow face centered on a black outline. The face is rendered as an SVG graphic using React components, with circle elements for the face and eyes placed relative to the window’s center. The code uses React and ReactDOM to render the SVG into the DOM, calculating dimensions from `window.innerWidth` and `window.innerHeight` and applying a transform to position the group at the center. The implementation is a fork of a previous example, adding stroke styling and responsive sizing.