JSFiddle - React, Tailwind, and code Playground

HTML

<div id="container">
    <div id="draggable">
        center
    </div>
</div>

CSS

div {
    margin: auto;
    width:100px
}

JavaScript

var wh = $(window).height();
var ch = $('#container').height();
var mt = (wh - ch) / 2;
$('#container').css('margin-top', mt)