Happy to help with this. Will take a look tomorrow.

Indeed, I must removed it a while ago. Please ping me at me[at]cpoul.dev and I'll check it asap

Here's[1] the CSS I use on my blog to treat the table of contents differently depending on screen width. I'm probably also "unqualified to be touching" this stuff so take it with a grain of salt.

[1] https://gitlab.com/kevinjfoley/assorted-array/-/blob/master/...