<table>
  <tr><td>Колонка 1</td><td>Колонка 2</td><td>Колонка 3</td></tr>
      <tr><td>1</td><td>2</td><td>3</td></tr>
      <tr><td>4</td><td>5</td><td>6</td></tr>
      <tr><td>7</td><td>8</td><td>9</td></tr>
</table>

* {
      border-color: red;
    }
    table {
      border-collapse: collapse;
    }
    td {
      border-bottom-width: 1px;
      border-bottom-style: solid;
      border-right-width: 1px;
      border-right-style: solid;
      padding: 5px;
    }
    tr:last-child td {
      border-bottom: none;
    }
    td:last-child {
      border-right: none;
    }