JSFiddle - React, Tailwind, and code Playground

HTML

<table>
    <tbody>
        <tr class="border_bottom">
            <td>Allen</td>
            <td>Chun</td>
        </tr>
    </tbody>
</table>

CSS

table{
    border-collapse:collapse;
}
tr.border_bottom {
    border-bottom: 1px solid #000;
}