Here is the CSS code for the table with border demo above:

table.border {
   border-collapse: collapse;
}

table.border th, table.border td {
   border: 4px inset #666666;
   padding: 4px;
}

Here is the HTML code for the table with border demo above:

<table class="border" style="width: 100%">
   <caption>Table Caption</caption>
   <colgroup>
      <col style="width: 20%"/>
      <col style="width: 80%"/>
   </colgroup>
   <thead>
      <tr>
         <th rowspan="2"></th>
         <th colspan="2">Multiple Column Heading</th>
      </tr>
      <tr style="vertical-align: bottom">
         <th>First Column Heading</th>
         <th>Second Column Heading</th>
      </tr>
   </thead>
   <tfoot>
      <tr><td colspan="2">This is an example of an HTML table footer.</td></tr>
   </tfoot>
   <tbody>
      <tr>
         <td>Row 1 Column 1</td>
         <td>Row 1 Column 2</td>
      </tr>
      <tr>
         <td>Row 2 Column 1</td>
         <td>Row 2 Column 2</td>
      </tr>
   </tbody>
</table>