Cambia colore se minore di 0

[lelemkop]

ho risolto così.

$db = new PDO ("mysql:host=$hostname; dbname=$dbname", $user, $pass);   if(isset($_POST['check'])){$date_str = $_POST['data'];
$converted = date("Y-m-d", strtotime($date_str));?>
<?php$sQuery22 = "SELECT maschera FROM utente where maschera like 'TOPOLINO' and data ='$converted'";
 $rResult22 = $db->query($sQuery22)->fetchAll(); 
$conta = count($rResult22);
echo "<table max-width:100px; border=\"2\"> \n"; echo " <tbody>";
echo "<thead>        <tr><th>Tipologia</th><th>Prenotati</th><th>Disponibilità</th></tr>    </thead> ";
 echo " <tr><td align =center width=200>",TOPOLINO,"</td>"; 
 if($conta>0)echo '<td align=center style="font-weight: bold; color: red;">'.$conta.'</td>';
else echo '<td align= center style="font-weight: bold; color: black;">'.$conta.'</td>';
 echo "<td align =center>1</td>";echo " </tbody></table>"; }?>