Forum:Header 2 Line

Hello. As the title says, I need help with the header 2 line. One wiki has a dark content area, and before the line underneath the second headers was barely visible. Now I have changed it a little bit, and it is no longer visible. I need some CSS to change the color of that line, if possible. I have tried things, but it only changes the color of the text. Thanks.  DaRanger  |  Talk to Me  |   What I've Done  | 17:48,8/5/2011