Disable Mobile Version

Hello, I have a problem with my website. http://talkingstories.de/ I'm currently using Catch Responsive and changed a lot of CSS. It appears that somehow influenced the mobile-version and it doesn't work right anymore. I tried to disable it with the viewport-line inside the header-tag, but I couldn't find it in header.php :( At the moment, the header is cut and the navigation is gone. Everything is floating left, but changing margin to auto doesn't help. I'd like to disable the mobile-version completely, so the website is shown the same on any screen. Regards!