background color for drop down folder

Hello!

http://radicaldeathstudies.com

I have been tasked to make some updates to the URL above. I cannot, for the life of me, find where to change the color of the drop down folder – or more importantly, where to change the hover color.

Please test by clicking About, and then hover over Our Mission – see how the hover color swaps to the same color as the folder behind it, making it impossible to see? 

Any help is MUCH appreciated!

Ahhhhh you are amazing. I inherited this site and am trying to clean it up – you saved the day. Thank you!