<table>
  <tr>
    <td>1</td>
  </tr>
  <tr>
    <td>3</td>
  </tr>
  <tr>
    <td>3</td>
  </tr>
</table>

table {
  border-collapse: collapse;
  width: 300px;
  border: 1px dotted green;
}

td {
  text-align: center;
  padding: 5px;
  background: linear-gradient(to bottom, #F00, #F00) center bottom no-repeat;
  background-size: calc(100% - 20px) 1px;
}

table tr:last-of-type td {
  background: none;
}