Hide Submenu 'Navigation Label text'

Hello,

I’ve created a megamenu of sorts and I’m trying to replace the Navigation Label text of the submenu with an image. I’ve downloaded and installed the ‘Menu Image’ plugin which works great but I’m left with the text.

I’m guessing I can use custom CSS but I’m not quite able to work out what it is I need to add there.

To see what I mean head to http://www.brap.fm/ and click the ‘Our Shows’ menu item at the top of the page. Next to the number 1 is the icon I’m using. It’s the numbers I’m trying to hide. I’ve discovered that if I leave the Navigation Label text empty the submenu disappears. Which is not ideal!

I’d rather not resort to a plugin like Ubermenu if I can help it.