JSFiddle - React, Tailwind, and code Playground

by Softlink

HTML

<div class="ops">
  <div class="opa"></div>
</div>

CSS

.ops{
width: 300px;
height:: 300px;
padding: 50px;
margin: 50px;
background: #ccc;
}

.opa{
  width: 100px;
  height: 200px;
  background: #222;
}

JavaScript

$(document).ready(function(){
       $('div.opa').each(function(){
        if($(this).closest('div.ops').length){
          $('div.ops').css('background', 'red');
        }
});

     });