JSFiddle - React, Tailwind, and code Playground

HTML

<div>
    <a id="button" href="#">REGISTER</a>
</div>
<div id="item" hidden>
   Some hidden content
</div>

CSS

/* this part only neccessary for IE10 and older */
*[hidden] {
    display: none;
}

JavaScript

$( "#button" ).click(function() {
    $( "#item" ).toggle();
});