This example shows a yellow smiley face rendered as a responsive SVG, with its circular head, two eyes, and a curved mouth positioned relative to the window dimensions. Built with React and D3 v7, it uses the `arc()` generator to create the mouth path, while plain SVG circles handle the head and eyes, all centered via a `<g>` transform. The visualization dynamically sizes itself to fill the browser viewport, demonstrating a simple declarative component-based approach to drawing shapes.