This example displays a world map using a light green fill for countries, white stroke outlines, and a light blue sphere background, rendered as an SVG. The map uses a Mercator projection via `d3.geoMercator()` and `d3.geoPath()`. Country boundaries are drawn from TopoJSON data loaded from a remote GitHub gist, processed with `topojson.feature()`. The visualization assigns CSS classes to style the sphere and country paths.