Menu in header suddenly overlays with top content of landing page in some browsers

[hoelzer]

Hey, thanks for the great template!

I just forked and adapted it and all was fine a few days ago. Today I noticed that the menu in the header overlays with the top content of the page. I first thought I changed smt wrong but then I checked your page and those of others using the template and it's the same problem:

I guess there was smt recently changed with some external library?

[hoelzer]

Alright, this seems to be a problem between different browsers. The screenshot above I made on my Macbook using Chrome.

Here is the page on Windows using Edge:

And here it looks totally fine on Windows using Firefox:

I am relatively sure, though, that it was also fine on my Macbook and Chrome a few days ago. But I might be wrong.