JSFiddle - React, Tailwind, and code Playground

HTML

<input type='checkbox' class='checkdisplay' />
<div class='todisplay'>test</div>

CSS

.todisplay {
    display:none;
}

JavaScript

$(document).ready(function () {
    $('.checkdisplay').change(function () {
        if (this.checked) $('.todisplay').fadeIn('slow');
        else $('.todisplay').fadeOut('slow');

    });
});