Somebody had fun with the web page.

Any-who,

--mono: "Berkeley Mono Trial", "Berkeley Mono", "IBM Plex Mono", "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;

Berkely Mono (which has been discussed on HN multiple times) is a fine font. The trial version reportedly has swapped / \ and # * glyphs which makes it an odd choice for first place.