JSFiddle - React, Tailwind, and code Playground

HTML

<table class="tblItemTemplate">
    <tr>
        <td>Cell</td>
        <td>Cell</td>
    </tr>
    <tr>
        <td>Cell</td>
        <td>Cell</td>
    </tr>
    <tr>
        <td>Cell</td>
        <td>Cell</td>
    </tr>
    <tr>
        <td>Cell</td>
        <td>Cell</td>
    </tr>
    <tr>
        <td>Cell</td>
        <td>Cell</td>
    </tr>
</table>

<table class="tblItemTemplate">
    <tr>
        <td>Cell</td>
        <td>Cell</td>
    </tr>
    <tr>
        <td>Cell</td>
        <td>Cell</td>
    </tr>
    <tr>
        <td>Cell</td>
        <td>Cell</td>
    </tr>
    <tr>
        <td>Cell</td>
        <td>Cell</td>
    </tr>
    <tr>
        <td>Cell</td>
        <td>Cell</td>
    </tr>
</table>

CSS

td{
    padding: 10px;
}

JavaScript

$('table.tblItemTemplate  td:first-child' td:).css('background-color', 'red');