This example displays a full-window yellow smiley face with black outlined eyes, rendered using React and SVG. The face is centered and sized dynamically based on the browser window’s dimensions, with eye positions and radii defined as constants. The code uses React’s `ReactDOM.render` to mount the SVG, which is built from nested `<circle>` elements within a transformed `<g>` group. The base template also includes a commented-out static SVG showing a fixed 960×500 version of the same face.