text formatting

I get the text “”Sorry you have no rights to view this entry!” only left-aligned. Is there a way that I can align it in the middle or right? I’ve already tried to align it left with css but unfortunately it didn’t work. I I would appreciate an idea how to solve the problem.Wouldn’t it also be an idea to install a link button in the admin area, e.g. that you can set left-aligned / centered / or right-aligned? And possibly the text can be formatted with other options.