JSFiddle - React, Tailwind, and code Playground

HTML

<input type="button" id="add_button" value="add button" />
<div id="add_new_div"></div>

CSS

#add_new_div {
    background: green;
    height: 150px;
    width: 150px;
    display: none;
}

JavaScript

$(document).ready(function()
{   
    $('#add_new_div').hide();
    $('#add_button').click(function (){hide_show_add_div();}); 
});

function hide_show_add_div()
{
    $('#add_new_div').toggle(900);
}