Stretch background image css

Question

<td class="style1" align='left' height='35'>
  <div style='overflow: hidden; width: 230px;'>
    <a class='link' herf='' onclick='topic(<?=$key;?>)'>
      <span id='name<?=$key;?>'><?=$name;?></span>
    </a>
  </div>
</td>

This is my CSS script

.style1 {
  background-image: url('http://localhost/msite/images/12.PNG');
  background-repeat: no-repeat;
  background-position: left center;
}

I want to stretch the background image all over the <td> cell