Allowing a horizontal scroll with a vertically fixed position element

Hi.

I want to have a horizontal scrolling toolbar within a vertically fixed position header.

When I apply “fixed position” to the header, the horizontal scroll stops working (because the header block is “fixed”). If I “unfix” the toolbar, then it scrolls off of the page when scrolling vertically.

So… how do I make the toolbar “fixed” vertically, but still maintain a horizontal scroll?

There is probably an easy solution, but I can’t think of it.

Thanks