JSFiddle - React, Tailwind, and code Playground

HTML

<style>.classOne { font-size:24px; color:#009900;}</style>

<script type="text/javascript">
$(function() {
    $('.something').on('click', function() {
        alert('hello');
        $(this).addClass('classOne');
    });
});
</script>

<div class="something"> Test information </div>