JSFiddle - React, Tailwind, and code Playground

HTML

<div class="review"></div>
<div class="tab"></div>

CSS

.review {
    width:100px;
    height:100px;
    background:red;
}
.tab:after {
    content:"hello";
    background:blue;
    display: none;
}
.tab.block:after {
    display: block;
}

JavaScript

$(".tab").toggleClass("block", $('.review').length > 0);