How to make link underline same color as text

[LuckyGraphics]

Hey, I've recently opened up my own forums.
Just a question, when editing the HTML Markup for usergroups I have changed the color of some of them. Except, when they are linked, the underline color is the same as the link color and not the color I set in the HTML Markup.

Is there any way to make the underline color the same as the custom HTML Markup color?

See what I'm talking about here: http://www.luckygfx.com/forum/index.php
Scroll down to the 'Who's Online?' section.

I apologize if this is in the wrong section but I do not see anywhere else to post this...

Thanks for any help,
Kevin