JSFiddle - React, Tailwind, and code Playground
HTML
<h2>Add a border to a table:</h2>
<table>
<tr>
<th>Firstname</th>
<th>Lastname</th>
</tr>
<tr>
<td>Peter</td>
<td>Griffin</td>
</tr>
<tr>
<td>Lois</td>
<td>Griffin</td>
</tr>
</table>CSS
table, th, td {
border: 1px solid black;
}