Instead of tweaking the template (which may be overridden by the next time the template is updated), I would recommend to add a CSS rule to the "userstyle.css" file in the config folder, which is a much cleaner solution.
You should still test that your CSS works with any updated template, of course, but at least it will still be there!
That, or simply using a different template that looks like you want it to look. It is not that there isn't enough choice...