color active pagelink in menu

I've been trying to change the color of the active page in the menu. On the forum I read about current_menu_item, but copying those lines into the css doesn't get the job done.
Changing the colors in the menu settings ( static, hover and focus) doesn't work either.
The hover function changes the fontcolor, but ones a page is selected the links turns to default again.
Please advice.

with kind regards,