Private message Color Change

[Richsballpythons]

I looked over in the templates but can not find where i can alter the menu color. Id like for the New private message link to be red when new messages have arrived.

Any idea on where to change this. I dont use images just the plain Text Link for the Menu.

I found the code but cant find where to edit it.

<a class="mainmenu" href="/privmsg?folder=inbox"><img id="i_icon_mini_message" src="https://2img.net/i/fa/empty.gif" border="0" height="13" hspace="2" alt="You have no new messages" title="You have no new messages" />You have no new messages</a>