JSFiddle - React, Tailwind, and code Playground

HTML

<table>
    <thead>
        <tr>
            <th>H1</th>
            <th>H2</th>
            <th>H3</th>  
        </tr>
    </thead>
    <tbody>
        <tr>
            <td>C1</td>
            <td>C2</td>
            <td>C3</td>
        </tr>
        <tr>
            <td>C1</td>
            <td>C2</td>
            <td>C3</td>
        </tr>
    </tbody>
</table>

CSS

table{
    width:100%
}

JavaScript

$("td, th").css("border-right","1px solid black");