I want to use the Atahualpa 3.5.1 theme. But I cant find a way to justify the light- a dark grey in the header area. Please give me a tip where a what I have to change.

Thank you so much

Bernhard

P.S. please have a look on the attached screenshot.

That's a background image made especially for that particular theme settings file. Read about the setting files that come with Atahualpa in ATO>Export/Import Settings