Change main menu text color

Hi,

As promised I bought your theme :) I have some questions, I hope they are simple to resolve.

The first one is about the color of the text of the main menu, in the header. By default the color of the text in the menu is the same as the body text. As I’m using a dark backgroud in the header I would like to change/force the color of the menu text to be #ffffff.
Can you help me with that?

Thank you,
Bruno Maia