No, not blocked. Nothing on the console too except that the loading of "plausible.js" was blocked.

PS. Played with it a bit and .box divs are zero-height. You need to have some content in <a> tags for them to not collapse vertically. This fixes it (somewhat) -

  document.querySelectorAll('.box a').forEach(e => e.innerHTML = ' ')

PPS. Also this .box rule is marked with "invalid property name" -

  aspect-ratio: 1/1

Thanks. I can't reproduce the issue on Chrome or Firefox (98), but I've just pushed an update that changes "aspect-ratio: 1/1", to "aspect-ratio: 1 / 1". Perhaps I needed those spaces.

Let me know if that solves it. :)

Edit: Looks like Firefox only got support for aspect-ratio in version 89, is your browser up to date?

I am on 88 and planning to stay on it for a while. Mozilla got way off track recently with their pointless UI changes and, more troubling, business "collaborations", so a conservative approach to updating is well-warranted.