JSFiddle - React, Tailwind, and code Playground

HTML

<span>
    <span id="x1" class="x">X1</span>
</span>
<span>
    <span>
        <span id="x2" class="x">X2</span>
    </span>
</span>

JavaScript

$('#x1').nextAll('.x').css({ 'background-color': '#CDEB8B' });