What menu is this and where do i find it?

By my count* the site has twenty (20) external stylesheets. It's got to be in one of them. But fundamentally what it's doing is changing between {display: inline} or possibly {display: inline-block} (I don't know which is optimal for lists) for wider windows, and {display: list-item} for narrower ones. You also need a <meta name="viewport" etc.; they've got one.


* Safari's count, if you want to quibble.

cool, looks too complex for me, I found another cool one that I think I can make work in my site.
thanks.