Thanks for your quick reply!
I just want to adapt the standardwhite-style a little bit and for this I copied and renamed the whole style-directory and made a few changes in the content.css (e.g. added the @import url for the Google Webfonts).
Furthermore I changed the name of the style in the config.xml-file.
Then I zipped the whole folder so that I can import it with the “Style Manager”. Trying this I get an error message that the “content.css”-file is missing, which is indeed not missing but correctly in the style-folder.
What I’m doing wrong?
Thanks for help!!!