Mega-menu heading colour (on roll-over)

Hi guys,
I’ve added a mega-menu to my site but the headings for each column don’t seem to be inheriting the theme colour at all, or they don’t have any styling?

How can I add the theme colour as the roll-over colour?
I want the colour to change on roll-over for ‘General Spanish Classes’, ‘Spanish for Business’ and ‘Spanish Exam Tuition’.

Speak soon,

Chris