Well, this point has nothing to do with the menue styling topic.
I like the shadow, therefore I manually copy this image to the theme media image library. I have to do this manually after each update. I now did it again.
But it really has nothing to do with the menua styling.
This is still changed to a transparent background and very light font color.
Did you change your css class names for the menue styling?
You normaly should use unique names only.