JSFiddle - React, Tailwind, and code Playground

by Slico

HTML

<div class="container">
    <div class="details">
        <span class="Title">My Title</span>
    </div>
<div class="details">
        <span class="Title">My Title</span>
    </div>
</div>

<div class="container">
    <div class="details">
        <span class="Title">My Title</span>
    </div>
<div class="details">
        <span class="Title">My Title</span>
    </div>
</div>

JavaScript

$(".container .details").children().addClass("header");