JSFiddle - React, Tailwind, and code Playground

HTML

<table id="tblSample" border="1" cellpadding="0" cellspacing="0" width="300px">
    <tr>
        <td>1</td>
        <td>1</td>
    </tr>
    <tr>
        <td>2</td>
        <td>2</td>
    </tr>
</table>

<table id="tblSample2" border="1" cellpadding="0" cellspacing="0" width="300px">
    <tr>
        <td>1</td>
        <td>1</td>
    </tr>
    <tr>
        <td>2</td>
        <td>2</td>
    </tr>
</table>

JavaScript

$("#tblSample > tbody > tr").css("background-color", "gray");

$("#tblSample2 tr").css("background-color", "gray");