A yellow smiley face with black-outlined eyes renders across the full browser window, centered on a responsive SVG canvas. The face is drawn using React and ReactDOM to generate SVG circles, with the head sized to fill the viewport height and the eyes positioned symmetrically relative to the center. The code computes dimensions dynamically from `window.innerWidth` and `window.innerHeight`, then applies a translation transform to center the graphic, using static offset values for eye placement and stroke width. No mouth or other facial features are included.