<table>
    <tbody>
        <tr>
            <td>lorem</td>
            <td>lorem</td>
            <td>lorem</td>
            <td>lorem</td>
        </tr>
        <tr>
            <td>lorem</td>
            <td>lorem</td>
            <td>lorem</td>
            <td>lorem</td>
        </tr>
        <tr>
            <td>lorem</td>
            <td>lorem</td>
            <td>lorem</td>
            <td>lorem</td>
        </tr>
        <tr>
            <td class="bd-hide" colspan="3"></td>
            <td>lorem</td>
        </tr>
    </tbody>
</table>

table {
    border-collapse: collapse;
}

td {
    border: 1px solid #000;
}

.bd-hide {
    border: none;
}