Use logo or header above menu

Hi there, I am using the Catch Responsive layout for quite a while now and am absolutely contented with it. I also use a child theme which works pretty well. Now I got a small problem with my website www.unterwasser-fotografieren.de When you look at my website, you can see the logo above the menu bar at the moment. I tried to change it for to use another image which would fit over the contents width. Like in that image. www.unterwasser-fotografieren.de/download/layout.jpg Now I don't have any more ideas how to get it work properly. I hope you can help me. Thank you in advance. Regards. Tino