JSFiddle - React, Tailwind, and code Playground

HTML

<div id="container">asdfsdf</div>

CSS

#container{
    height: 100px;
    width: 100px;
    background: red;
}

JavaScript

$.fn.center = function () {
    $(this).css({'position': 'absolute',
                 'top': $(window).height()/2 - $(this).height()/2,
                 'left': $(window).width()/2 - $(this).width()/2
                });
};
$('#container').center();