One more CSS question

I am having a tough time isolating the code to control the subnavigation font color. If you go to the site:

www.insigniainspirations.com/bath-kitchen-design/

and click on 'portfolio' - you will notice that the hover menu under 'portfolio' when it is selected is black and I need it to be white to contrast with the background color. I had tried this:

.active ul li a span{
color: #ffffff;
}

and a few other options but none of them are working. How can I access the font color for just that hover menu (when the parent has been selected)?

Thanks.

add !important inside that rule: and add the next rule at the end:

That works. Thank you!