change block background color to fzjgray

beamercolorthemeJuelich.sty

@@ -99,7 +99,7 @@
 \setbeamercolor{block title alerted}{use=alerted text,fg=white,bg=alerted text.fg}
 \setbeamercolor{block title example}{use=example text,fg=white,bg=example text.fg}
 
-\setbeamercolor{block body}{parent=normal text,use=block title,bg=block title.bg!10!bg}
+\setbeamercolor{block body}{parent=normal text,use=block title,bg=fzjgray}
 \setbeamercolor{block body alerted}{parent=normal text,use=block title alerted,bg=fzjgray}
 \setbeamercolor{block body example}{parent=normal text,use=block title example,bg=fzjgray}