This example renders a yellow smiley face that fills the browser window, scaling with the viewport dimensions. The face, eyes, and mouth are drawn as SVG shapes inside a React component, with the smile created using the d3 `arc` generator applied to a path. The code uses React 16.9 for the component structure, d3.v5 for the arc calculation, and positions all elements relative to the window’s center. The face’s radius adapts to the window height, and the eyes and mouth are offset by fixed pixel values, resulting in a responsive, SVG-based illustration.