JSFiddle - React, Tailwind, and code Playground

HTML

<div>.</div><br>
<div>.</div><br>
<div class="test">Should have a blue border</div><br>
<div>.</div><br>
<div>.</div><br>
<div>.</div><br>
<div>.</div><br>
<div>.</div><br>
<div>.</div><br>
<div>.</div><br>

CSS

div {
    border: 1px solid black;
}

JavaScript

$('div:last').css('border', '1px solid red')
    .prev('.test').css('border', '1px solid blue');