My b2evolution Version: Not Entered

Hello everyone.

I am creating a blog that will be integrated in my website.
This is an example, but that is not the one finally will be integrated but this is enough for clearing up my question.

http://www.liberalisme.info/evo/

I deleted the header, but now I still have a sort of blue header. I can't find where I can change te color of it.
I am using the custom skin.

So I hope that someone can help me out.

Thanks