Z-index on dropdown/navbar

Hi guys!

I have a small problem with my navigation. There is two navbars in one section at the top of my site. The first with the most important items (including a dropdown), and the second with some subitems. I have played around with static and absolute positioning to get the second navbar to be horizontal and full width.

The problem is that when the second navbar is open, the dropdown from the first navbar hides behind it if opened. I bit hard to explain, but very obvious if you see the site :nerd_face:

Any suggestions to this? I have played around with a dropdown instead of a second navbar also, but I think the same issues will come into play that way as well.

Here is my site Read-Only