<!DOCTYPE html>
<table style="width: 300px" cellspacing="0" cellpadding="0">
    <td style="background: red;">
      <div style="background: blue">
        <table cellspacing="0" cellpadding="0">
            <td style="width:1%; background: yellow;">
                <div style="width:20px; height:150px;"></div>
            </td>
        </table>
      </div>
    </td>
    <td style="background: green;">
        <div style="width:40px; height: 150px;"></div>
    </td>
</table>