JSFiddle - React, Tailwind, and code Playground

HTML

<div class="myCLASS">This is a myClass</div>
<div class="noClass">This is not a myClass</div>
<div class="myCLASS">This is a myClass</div>
<div class="noClass">This is not a myClass</div>
<div class="myCLASS">This is a myClass</div>
<div class="noClass">This is not a myClass</div>
<div class="myCLASS">This is a myClass</div>
<div class="noClass">This is not a myClass</div>

JavaScript

$('body :not(.myCLASS)').fadeTo(400,0.1);