You should have noticed, setting up your YaBB, that the news background color wasn't controlled by css, but from the admin panel: if you have installed a "user template" style mod you can find that this is a little annoying..
here is the little change you have to do:
in BoardIndex.pl search for

      if($shownewsfader == 1) {
            if(!$fadedelay) { $fadedelay = 5000; }
            $yymain .= qq~
<table border=0 width="100%" cellspacing="0" cellpadding="0" bgcolor="$color{'bordercolor'}" class="bordercolor">
  <tr>
    <td>
    <table cellpadding="4" cellspacing="1" border="0" width="100%">
      <tr>
        <td bgcolor="$color{'titlebg'}" class="titlebg" align="center"><font class="text1" color="$color{'titletext'}" size="2"><b>$txt{'102'}</b></font></td>
      </tr><tr>
        <td bgcolor="$color{'windowbg2'}" valign="middle" align="center" height="60">
<script language="JavaScript1.2" type="text/javascript"> 

and replace with

      if($shownewsfader == 1) {
            if(!$fadedelay) { $fadedelay = 5000; }
            $yymain .= qq~
<table border=0 width="100%" cellspacing="0" cellpadding="0" bgcolor="$color{'bordercolor'}" class="bordercolor">
  <tr>
    <td>
    <table cellpadding="4" cellspacing="1" border="0" width="100%">
      <tr>
        <td bgcolor="$color{'titlebg'}" class="titlebg" align="center"><font class="text1" color="$color{'titletext'}" size="2"><b>$txt{'102'}</b></font></td>
      </tr><tr>
        <td bgcolor="$color{'windowbg2'}" class="windowbg2" valign="middle" align="center" height="60">
<script language="JavaScript1.2" type="text/javascript"> 

greets  

ps the code above changes only 1 line.. I've inserted an other few if you want to make a mod with this!