Thank you Sanjip. But it did not work unfortunately. Do you think changing the theme and then changing it back to attitude could work? I am happy for any tips!
ok, I just tried changing the theme and back. Other themes work, but attitude I seemed the have manipulated the code somehow. Is there a possibility to get the whole correct style.css so I can copy it in? Or can I delete it and download it again- how does that work?