Fork of Smiley Face Part II
This example renders a yellow smiley face with black stroke and eyes, centered to fill the browser window. It uses React to create an SVG element, positioning circles via computed center coordinates and offsets. The D3.js `arc` function defines the mouth shape, though the index.js file contains a duplicate declaration that would cause a runtime error. The visualization adapts its size dynamically to the window dimensions, using the viewport height to determine the face radius.