JSFiddle - React, Tailwind, and code Playground

HTML

<table>
<tr>
    <td></td><td></td><td></td>
</tr>
<tr>
    <td></td><td></td><td></td>
</tr>
</table>

CSS

body {background-color: beige;}
table {border-collapse: separate;}
table td { width: 50px; height: 50px;}
table tr:first-child td {border: 1px solid #fff; }
table tr:last-child td {border: 1px solid #0000FF; }