Get rid of "Category Archives" but leave the category name in

Hi, I know how to get rid of the "Category Archives: Category Name" with the custom css. But I have a different problem. I want to keep the category´s name but just cut out the 2 words "Category Archives:". Here´s my page: dietraumfabrik.de/category/fitness It should just say "Fitness" at the top and leave out "Category Archives:" Is that possible and if yes, then how? :-)