JSFiddle - React, Tailwind, and code Playground

HTML

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<p>There are some texts</p>
<div class="specific_element">
  sth
</div>
<p>whatever</p>

CSS

body{
  border: 1px solid;
}
.specific_element{
  border: 1px solid red;
}

JavaScript

$('body').not('.specific_element').css('opacity','.3');