Change size of quantity discount border (width)?

Hi,

I have searched the forum but cannot find out how to change the width of a module border (in this case it's quantity discounts). I found the correct tpl page - tpl_modules_products_quantity_discounts.php and the text from this is below but I am unsure how to change it. Have tried adjusting cell padding from 2 to 30 but it made no difference. Can someone tell me what I am missing?

?>
<div id="productQuantityDiscounts">
<?php
  if ($zc_hidden_discounts_on) {
?>
  <table border="1" cellspacing="2" cellpadding="2">
    <tr>
      <td colspan="1" align="center">
      <?php echo TEXT_HEADER_DISCOUNTS_OFF; ?>
      </td>
    </tr>
    <tr>
      <td colspan="1" align="center">
      <?php echo $zc_hidden_discounts_text; ?>
      </td>
    </tr>
  </table>
<?php } else { ?>
  <table border="1" cellspacing="2" cellpadding="2">
    <tr>
      <td colspan="<?php echo $columnCount+1; ?>" align="center">
<?php
  switch ($products_discount_type) {
    case '1':
      echo TEXT_HEADER_DISCOUNT_PRICES_PERCENTAGE;
      break;
    case '2':
      echo TEXT_HEADER_DISCOUNT_PRICES_ACTUAL_PRICE;
      break;
    case '3':
      echo TEXT_HEADER_DISCOUNT_PRICES_AMOUNT_OFF;
      break;
  }
?>
      </td>
    </tr>

    <tr>
      <td align="center"><?php echo $show_qty . '<br />' . $currencies->display_price($show_price, zen_get_tax_rate($products_tax_class_id)); ?></td>

<?php
  foreach($quantityDiscounts as $key=>$quantityDiscount) {
?>
<td align="center"><?php echo $quantityDiscount['show_qty'] . '<br />' . $currencies->display_price($quantityDiscount['discounted_price'], zen_get_tax_rate($products_tax_class_id)); ?></td>
<?php
    $disc_cnt++;
    if ($discount_col_cnt == $disc_cnt && !($key == sizeof($quantityDiscount))) {
      $disc_cnt=0;
?>
  </tr><tr>
<?php
    }
  }
?>
<?php
  if ($disc_cnt < $columnCount) {
?>
    <td align="center" colspan="<?php echo ($columnCount+1 - $disc_cnt)+1; ?>">   </td>
<?php } ?>
    </tr>
<?php
  if (zen_has_product_attributes($products_id_current)) {
?>
    <tr>
      <td colspan="<?php echo $columnCount+1; ?>" align="center">
        <?php echo TEXT_FOOTER_DISCOUNT_QUANTITIES; ?>
      </td>
    </tr>
<?php } ?>
  </table>
<?php } // hide discounts ?>
</div>

Image showing how the border is currently the entire width of the page - I would like to make this box smaller width-wise.

Thanks for any help you can give.

Is ok, I have managed to sort this through the product_info.css