Fork of Smiley Face Part II
A dynamic, full-window smiley face rendered as a responsive React SVG, with the yellow circular face, black outline, and two eyes positioned relative to the viewport center. The code uses React 16.9 and ReactDOM to compute dimensions from `window.innerWidth` and `window.innerHeight`, then draws shapes via SVG `<circle>` elements inside a transformed group. The face scales to any screen size, while the mouth remains an unimplemented comment in the markup, leaving the smiley incomplete.