How Do I Remove Underline (Hover??) from Top Menu Bar?

How Do I Remove Underline (Hover??) from Top Menu Bar?

I'm currently building a Zoho site for my small business (it's actually live already but I'm just tweaking it a little), and the color scheme I'm going for is a dark blue meets green because that's what my logo is, and the theme for my site revolves around red. I've been able to get away with getting rid of most of the red stuff, but whenever a visitor (or me) clicks on a menu item, there's a red underline under it. I've been trying to get rid of it, and tons of forums online have CSS codes but none of them work. If anyone knows the fix it'd be much appreciated.