Homestore Menu

Hi Guys,
The default Homestore theme has a black line below the menu, this one also had and for some reason it has gone, I can’t remember when today as I was busy editing the site but realized a few mins ago the line is now missing.

Any ideas?

(also, how would one edit the background colour of a dropdown menu?)

Thank You

The page I need help with: [log in to see the link]