faded back smile
A smiley face rendered in React and D3 uses a white-to-black gradient for its face, with a contrasting khaki gradient for its stroke, eyes, and mouth. Built with an SVG canvas, the code employs `d3.arc` to define the mouth path, while React components structure the face elements. The face gradient and accent gradient are defined in SVG `defs`, producing a subtle, faded back effect.