Fork of Smiley Face Part II
A yellow smiley face is rendered across the full browser window using React and D3 v7, with its circular head, eyes, and mouth drawn as SVG shapes. The face's dimensions and positions are calculated from the window size, and its mouth is generated using D3's `arc` function to create a specific curved path. The visualization demonstrates a straightforward combination of React's declarative component structure with D3's geometry utilities within an SVG canvas.