This example renders a simple yellow smiley face as an SVG graphic inside a React application. The face, eyes, and mouth are drawn using D3’s `arc()` generator and basic SVG shapes, with all styling handled in CSS. The component uses React’s `ReactDOM.render()` to mount the visualization, while D3 v6 supplies the arc path for the mouth. The graphic fills the entire viewport, with the face radius calculated from the window dimensions.