hsGUI nav map too dark for me

[GreyBeard]

I finally found a Gui for GWX that I like, but the navmap is too dark. It's as if it's night all the time on the navmap. Indeed, when night rolls around there is a small moon that pops up in the right hand corner of the map informing that it is night. I like that feature, but the map itself is just too dark for my liking. I cannot figure out how to change it. Can anyone help me with that?