A friendly cartoon frog face fills the browser window, built entirely from layered SVG ellipses and circles rendered with React elements. The code uses ReactDOM to mount an `<svg>` that scales to the viewport, with all facial features positioned relative to the center. Green shapes form the head and eye bumps, white and black circles create the eyes, firebrick and green ellipses compose the mouth, and black ellipses serve as nostrils. The implementation relies on JSX and React's rendering API, with no external visualization libraries.