This example displays a world map with countries rendered in green on a dark blue sphere, using D3 v5 and TopoJSON. It projects geographic data with the Natural Earth projection via `d3.geoNaturalEarth1` and `d3.geoPath`, drawing country boundaries from the world-atlas TopoJSON dataset. The map loads country features from the 110m resolution file and applies sphere and country CSS classes to the SVG paths.