JSFiddle - React, Tailwind, and code Playground

HTML

<div class="hidden2">открыть...</div>
<div class="open2">скрытый</div>

CSS

.hidden2 {cursor: pointer; background: #fb6705;padding: 10px 25px;color: #fff;margin: 5px;}
.open2 {display: none}

JavaScript

$('.hidden2').on('click', function(){    
    $('.open2').toggle("slow");
	});