okay i see the code, and how it should show a white block behind the text for the day, but here is how it shows up, and here is my code.
$now = mktime();
     $today = date('j',$now);
     $year = date("Y",$now);
     $month = date("n",$now);
     $days = array($today=>array(NULL,NULL,'<a class="smalltext" style="color: steelblue; font-weight: bold; border: solid 1px black; background-color: white; padding: 0px 4px 0px 4px;" href="'.$scripturl.'?action=calendar;sa=post;month='.$month.';year='.$year.';day='.$today.'" target="_self">'.$today.'</a>'));
     $day_name_length = 3;
     $month_href = $scripturl . '?action=calendar';
     $first_day = 1;
     $pn = array();
$first_of_month = gmmktime(0,0,0,$month,1,$year);
#remember that mktime will automatically correct if invalid dates are entered
# for instance, mktime(0,0,0,12,32,1997) will be the date for Jan 1, 1998
# this provides a built in "rounding" feature to generate_calendar()
$day_names = array(); #generate all the day names according to the current locale
for($n=0,$t=(3+$first_day)*86400; $n<7; $n++,$t+=86400) #January 4, 1970 was a Sunday
$day_names[$n] = ucfirst(gmstrftime('%A',$t)); #%A means full textual day name
list($month, $year, $month_name, $weekday) = explode(',',gmstrftime('%m,%Y,%B,%w',$first_of_month));
$weekday = ($weekday + 7 - $first_day) % 7; #adjust for $first_day
$title  = htmlentities(ucfirst($month_name)).' '.$year; #note that some locales don't capitalize month and day names
#Begin calendar. Uses a real <caption>. See http://diveintomark.org/archives/2002/07/03
@list($p, $pl) = each($pn); @list($n, $nl) = each($pn); #previous and next links, if applicable
if($p) $p = '<span class="smalltext">'.($pl ? '<a href="'.htmlspecialchars($pl).'">'.$p.'</a>' : $p).'</span> ';
if($n) $n = ' <span class="smalltext">'.($nl ? '<a href="'.htmlspecialchars($nl).'">'.$n.'</a>' : $n).'</span>';
$calendar = '<table>'."\n".
'<caption >'.$p.($month_href ? '<a href="'.htmlspecialchars($month_href).'">'.$title.'</a>' : $title).$n."</caption>\n<tr>";
if($day_name_length){ #if the day names should be shown ($day_name_length > 0)
#if day_name_length is >3, the full name of the day will be printed
foreach($day_names as $d)
$calendar .= '<th class="smalltext" abbr="'.htmlentities($d).'">'.htmlentities($day_name_length < 4 ? substr($d,0,$day_name_length) : $d).'</th>';
$calendar .= "</tr>\n<tr style=\"text-align:right;\">";
}
if($weekday > 0) $calendar .= '<td class="smalltext" colspan="'.$weekday.'"> </td>'; #initial 'empty' days
for($day=1,$days_in_month=gmdate('t',$first_of_month); $day<=$days_in_month; $day++,$weekday++){
if($weekday == 7){
$weekday  = 0; #start a new week
$calendar .= "</tr>\n<tr style=\"text-align:right;\">";
}
if(isset($days[$day]) and is_array($days[$day])){
@list($link, $classes, $content) = $days[$day];
if(is_null($content)) $content = $day;
$calendar .= '<td "'.($classes ? ' class="'.htmlspecialchars($classes).'">' : '>').
($link ? '<a href="'.htmlspecialchars($link).'">'.$content.'</a>' : $content).'</td>';
}
else
{
$calendar .= "<td class=\"smalltext\" style=\"padding-right:4px;\"><a";
if(((($weekday+$first_day) % 7)==0)||((($weekday+$first_day) % 7)==6))
{
$calendar .= ' style="color:#C00000;"';
}
$calendar .= " href=\"".$scripturl."?action=calendar;sa=post;month=".$month.";year=".$year.";day=".$day."\" target=\"_self\">$day</a></td>";
}
}
if($weekday != 7) $calendar .= '<td class="smalltext" colspan="'.(7-$weekday).'"> </td>'; #remaining "empty" days
echo $calendar."</tr>\n</table>\n";
the code was copied exactly from your original post, and the correction you just suggested was already in place.
as you can see from the below, the current day, the seventh, is only white and barely distinguishable from the other day which are a light-green or light-blue.
screenshot: