JSFiddle - React, Tailwind, and code Playground

HTML

<body>
    <table>
        <tr>
            <td>cell</td>
            <td>cell</td>
            <td>cell</td>
        </tr>
        <tr class="ownbg">
            <td>cell</td>
            <td>cell</td>
            <td>cell</td>
        </tr>
    </table>
</body>

CSS

table {border-collapse:collapse;}
tr {border:2px solid black;}
tr.ownbg {background-color:#F0F0F0;}