A yellow smiley face drawn with SVG circles and an arc path responds to the browser window size, centering itself dynamically via React’s render loop. Built with React 16.9 and D3’s `arc` helper, the face uses hardcoded properties for eye offset, radius, and mouth curvature. The SVG viewport fills the entire window, and the face’s position and size recalculate on mount, demonstrating interactive layout without explicit event handlers.