JSFiddle - React, Tailwind, and code Playground

HTML

<section class="subscribe">
    <button id="submitBtn" type="submit">Subscribe</button>
    <div id="asd">Thanks for your interest!</p>
</section>

CSS

.subscribe #asd{
    display:none;
}

JavaScript

$(function () {
    $("#submitBtn").click(function (event) {
        $("#asd").slideDown({duration: 400});
    });
});