JSFiddle - React, Tailwind, and code Playground

HTML

<div class="ddd back7">d</div>
<div class="fff back7">f</div>
<div class="ggg back7">g</div>

CSS

.ddd,.eee,.fff,.ggg{
    width:100px;
    height: 100px;
    background:blue
}

.back7{
    background:red;
}

JavaScript

$('.ddd','.fff','.ggg').removeClass('back7'); //Does not work


	//$('.ddd').removeClass('back7');//Does
	//$('.fff').removeClass('back7');//Does
	//$('.ggg').removeClass('back7');//Does