Colours in the Menue

Hi,

thanks for the great theme!

I got a question about the color in the Navigation.

https://WWW.hgv-barssel.de

The categorie-menue-header in the blue bar are NOT in white color as the pages.

https://www.com–padres.de/TEST/1.png

https://www.com–padres.de/TEST/2.png

https://www.com–padres.de/TEST/3.png

How can I change this colour?

Thanks for your help in advance.

Arne