JSFiddle - React, Tailwind, and code Playground

HTML

<div>
    <div></div>
    <div></div>
    <div></div>
</div>

CSS

div div {
    height: 100px;
    width: 100px;
    background: red;
}

JavaScript

$(function () {
    $('div div').eq(1).css('background', 'blue');
});