Those fonts probably aren’t available (by default) on Linux because they have proprietary licences.
(Not that it’s likely to be the root of the problem of course.)
It’s a bit of effort but I’d advise reworking the layout to use CSS flexbox.
I’ve dabbled in making my own website and found it’s a lot easier than messing around with things like float and z-index.
There’s a pretty good explanation of the various aspects of it here:
Thanks for the info but I am not about to pull apart the pages to do again. I was sort of hoping these tools would end up on the Arduboy site - not mine. @bateske is this possible?
If I cannot get them looking good, I will try what @MLXXXp suggested and either move the instructions below the drop box or move them to a different page.
