This is the codes:

<table border="3" bordercolor="gray" cellpadding="30" width="600">
 <tbody>
  <tr>
   <td align="center" bgcolor="beige">DOCTYPE html
   <style type="text/css">p.normal {    border: 2px solid red;}p.round1 {    border: 2px solid red;    border-radius: 5px;}p.round2 {    border: 2px solid red;    border-radius: 8px;}p.round3 {    border: 2px solid red;    border-radius: 12px;}
   </style>
   <h2>The border-radius Property</h2>

   <p>This property is used to add rounded borders to an element:</p>
   &nbsp;

   <p class="normal">Normal border</p>
   &nbsp;

   <p class="round1">Round border</p>
   &nbsp;

   <p class="round2">Rounder border</p>
   &nbsp;

   <p class="round3">Roundest border</p>
   &nbsp;

   <p><b>Note:</b> The &quot;border-radius&quot; property is not supported in IE8 and earlier versions.</p>
   </td>
  </tr>
 </tbody>
</table>

This thing does not work in Zeroboard 4 but works here !!