This example renders a responsive smiley face using React as a component-based SVG visualization. The face is centered on the window and adapts its size and position to the viewport dimensions, with a yellow circle for the head, two black eyes, and a stroke outline. The code defines constants for eye offset, radius, and stroke width, then generates the SVG elements via React's declarative JSX syntax, relying on `ReactDOM.render` to mount the component. It uses no external data sources or animation, presenting a static, geometry-driven graphic.