JSFiddle - React, Tailwind, and code Playground

HTML

<html>

    <body>
        <div id="wrap">
        <div class="button">Click</div>
        
        <div class="banner">Banner</div>
    </div>
    </body>
</html>

CSS

#wrap{position: relative;height:200px}

.button{background:red;}

.banner{background:blue;width:100%;height:20px;position:absolute;bottom:0px;left:0px;}

JavaScript

$(document).ready(function(){
    $('.button').click(function(){
        $('.banner').slideToggle();
    });
});