Can't delete some style

Hi, i have some style in my project that can’t be deleted.
I’ve tryed to duplicate the project, deleted the pages, the symbols etc, deleted all the unused style, but there is always some style that can’t be deleted. I have only an empty home page, also the 404 and Password page are empty.

Anyone can help me?
Thanks.

What style? (name)

+ Please Add read-only link