I solved the problem: in the content.opf "style.css" was still in uppercast ("Style.css). Changing the uppercast solved the problem. However another problem popped up when I validated the epub file online at threepress. I got the following messages:
Error: Pole.epub: resource OEBPS/Styles/style.css is missing
Warning: Pole.epub: item (OEBPS/styles/Style.css) exists in the zip file but is not declared in the OPF file.
As indicated in the warning message there was still an uppercast Style.css in the zip version. In the zip you can't rename so I used a trick. I made a copy of the zip file, unzipped that copy, rename the Style.css and copied that file inti the zip file. It worked!
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