[Someone1234]

If you're viewing that website on a desktop, I strongly suggest removing max-width: 90ch from the body css. Instead of 50% white space, it goes full width and makes the table substantially more readable (particularly the code samples).

[munk-a]

Hilariously enough I was initially confused by this comment because the webpage rendered so readably for me - the base CSS is actually quite reasonable and because I have JS disabled by default the page never re-rendered into the thinner mode.

[Someone1234]

It may be my specific setup. But on a 1440p display, 125% OS scale, I'm seeing more white left/right than actual content in the middle. It is also wrapping the code making it difficult to read.

Completely readable at 100% width though.

[pacoverdi]

I viewed it on Firefox for Android and I immediately had to jump to reader mode for the same reason.

But I tend to use reader mode on most sites anyway because it's an easy way to get rid of banners (cookies, subscription etc.)