semi OT: I love the “dark mode” on that page :-)
On the contrary, I don’t — I find the yellow background to be an eyesore, and the unusable “dark mode” just rubs it in.
Thankfully, browsers’ reader mode is a thing, but at least on Firefox Mobile, it breaks the formatting of the code…
you can use a bookmarklet to just set background and foreground colours. this is a good collection: https://www.squarefree.com/bookmarklets/zap.html