JSFiddle - React, Tailwind, and code Playground

HTML

<div id="panel">
    
        <div id="panel-content"></div>
        <div id="panel-tab">
            <div id="myTab">
                <p>Click</p>
            </div>
        </div>

    </div>

CSS

#panel
{
    position: absolute;
    height: 100%;    
    background: transparent;
    right: 0;
}

#panel-content
{
    position: relative;
    width: 175px;
    height: 100%;
    background: black;
    float:right;
}

#panel-tab
{
    position: relative;
    width: 50px;
    height: 100%;
    background-color: transparent;
    float:left;
}

#myTab
{
    position: relative;
    top: 150px;    
    background: black;
    height: 200px;
    width: 90%;
    color: White;
}

#myTab p
{
    margin: 0;
}

JavaScript

$(function () {
    
    var $pCont = $("#panel-content");
    $pCont.width(0);
    $("#panel").hover(function(ev){
        $pCont.stop().animate({width: ev.type=="mouseenter" ? 500 : 0}, 700);
    });

});