A yellow circle with a facial expression rendered as a smiley face sits atop a full-screen background image, which is tiled into the SVG via a `<pattern>` and `<image>` element. The React component uses `window.innerWidth` and `window.innerHeight` to size the viewport, and positions the face at the center. SVG circle elements create the head, eyes, and mouth, with stroke and fill attributes defining the visual style. The implementation relies on React's `ReactDOM.render` to mount the SVG tree, using only native SVG and React APIs without external charting libraries.