Class Colors

I'd like to know exactly how you can do something like this: <table width="270" border=0 cellpadding=0 cellspacing=0 class="yellowbox">
      <tr>
        <td>&nbsp;&nbsp;<b>Welcome to GreatSmokyMountains.com</b></td>
      </tr>
    </table> Look at the orange table on http://www.greatsmokymountains.com/index.cfm. Could someone please look at the source code of that web page and show me where the code is for Class (ex: class="yellowbox").

.yellowbox {
  background: #E49448;
  border: 1px solid #575757;
} 

Edited by dfrancis - 03 September 2005 at 3:36pm