JSFiddle - React, Tailwind, and code Playground

HTML

<div id="toppanel">
            <div id="panel">
                <div id="panel_contents"> </div>

                    <p>Content<p>

            </div>
            <div class="panel_button">Button Down</div>
            <div class="panel_button" id="hide_button" style="display: none;">Button Up</div>
        </div>
        
        <div class="the_content">
            <p>Donec sed odio dui. Praesent commodo cursus magna, vel scelerisque nisl consectetur et. Donec sed odio dui. Etiam porta sem malesuada magna mollis euismod. Nulla vitae elit libero, a pharetra augue. Cum sociis natoque penatibus et magnis dis parturient montes, nascetur ridiculus mus. Nullam quis risus eget urna mollis ornare vel eu leo.</p>
        </div>

CSS

#toppanel {
    z-index: 25;
    text-align: center;
    position: absolute;
    top: 0px;
    left: 0px;
}
#panel {
    position: relative;
    height: 0px;
    margin-left: auto;
    margin-right: auto;
    z-index: 10;
    overflow: hidden;
    text-align: left;
    height: 0px;
    display: block;
    background-color: #efefef;
    border: 1px solid #000;
    width: 150px;
}
#panel_contents {
    height: 100%;
    width: 603px;
    position: absolute;
    z-index: -1;
}
.the_content {
    margin-top:40px;
}

JavaScript

jQuery(document).ready(function() {
    jQuery('#toppanel').click(function(event){
         event.stopPropagation();
     });
    jQuery("div.panel_button").click(function(){
        jQuery("div#panel").animate({ height: "250px" }, "fast");
        jQuery("div.panel_button").toggle()
    }); 

    jQuery("div#hide_button").click(function(){
        jQuery("div#panel").animate({height: "0px"}, "fast"); 
    });
});