This example shows a large yellow smiley face rendered in SVG, with two black eyes and a curved mouth, sized to fill the browser window. The face is built using React components, with the mouth path generated by the d3 `arc` function to create the curve. Circles for the head and eyes are drawn using SVG elements, and the entire face is centered using a translation transform. The visualization uses React 16.9, D3 v7, and is fully responsive to the viewport dimensions.