JSFiddle - React, Tailwind, and code Playground

HTML

<a href="#">Link</a>

<div id="hiddendiv"></div>

CSS

#hiddendiv{
    height:120px;
    width:120px;
    background-color:red;
}

JavaScript

$("#hiddendiv").hide();
$("a").on("click", function(e){
    e.preventDefault();
$("#hiddendiv").toggle();
});