JSFiddle - React, Tailwind, and code Playground

HTML

<table>
    <tr>
        <td>1</td>
        <td>2</td>
        <td>3</td>
    </tr>
</table>

CSS

table {
    width: 100%;
    border-collapse: collapse;
}

table tr td {
    border-bottom: 1px solid green;
}