Smily Face Part 2
A yellow smiley face with black outlines is centered on an SVG canvas that fills the entire browser window. The face has two black eyes and a circular yellow head, but lacks a mouth, stopping at the halfway point of a complete expression. The visualization uses React 16.9 to render SVG elements, with circle shapes positioned relative to the viewport center. The code calculates dimensions from `window.innerWidth` and `window.innerHeight`, and ReactDOM mounts the component to the HTML root element.