JSFiddle - React, Tailwind, and code Playground

HTML

<div id="fan_likes">
<a href="" class="button">Continue</a>
<ul class="facebook-likes">
    <li>
        <input type="radio" name="like" id="0" class="input-hidden" value="0" />0</li>
    <li>
        <input type="radio" name="like" id="1" class="input-hidden" value="1" />1</li>
    <li>
        <input type="radio" name="like" id="2" class="input-hidden" value="2" />2</li>
    <li>
        <input type="radio" name="like" id="3" class="input-hidden" value="3" />3</li>
</ul>
</div>

CSS

.faded {
    opacity:0.2;
}

JavaScript

$('.facebook-likes li input').on('click', function() {
    $('#fan_likes a.faded').addClass('faded');
})