A responsive smiley face drawn with React and SVG. The component measures the browser window to size the face and position it at the center, using the window height to set the head radius and fixed offsets for the eyes and mouth. React 16.9 renders the SVG elements, including yellow fill and black stroke for the head, while the eyes and mouth use default black fill. The layout updates only on initial render, not on window resize, and the code includes no interactive behavior.