Change color of all hyperlinks – How?

I added the code below to the quick CSS box in hopes of changing all hyperlinks to a bold red – I am using the “brown” color scheme but the link color in the brown color scheme is very hard to see and distinguish as a link. However, nothing changes when I enter the code. I also attempted to add the code to the custom CSS file but that did not work either. Please help.

a strong { color: #996600; important; }