bialabs, your Joomla Art template should have a menu class sfx to which you can apply to my menu! Research the template you are using!
Typically something like -menu or -green or-nav, something like that which you can enter into my mods "Module Class Suffix" and/or "Menu Class Suffix".
Otherwise, stying a menu via css is something I cannot walk you r through. There are many good menu css lessons available online.