Fork of Smiley face Tweak
A stylized smiley face is rendered as a yellow circle with black stroke, two black eyes, and a lip-shaped mouth, all centered in an SVG canvas. The face is constructed using React components, with the mouth drawn via a D3 `arc()` generator configured with inner and outer radii and start/end angles. The face dimensions, eye offsets, and mouth parameters are defined as constants, and the SVG elements are positioned using a `translate` transform. The example uses d3.v7 and React 16.7 to compose the visualization.