showing url as a QR code

qr-pure-js.js

(function() {
    function cssAsNum(width){
        return Number(width.replace("px",""))
    }
    var body,img;
    body = document.body;
    img = document.createElement("img");
    img.style.userSelect = "none";
    img.style.position = "fixed";
    img.style.zIndex = 999999;
    img.style.display = "none";
    img.src = 'http://chart.googleapis.com/chart?cht=qr&chs=150x150&chl=' + escape(window.location.href);
    body.appendChild(img);
    img.onclick = function() {
        body.removeChild(img);
    };
    img.onload = function() {
        var imgStyle;
        img.style.display = "";
        imgStyle = window.getComputedStyle(img, null);
        img.style.left = (window.screen.width / 2 - cssAsNum(imgStyle.width) / 2) + "px";
        img.style.top = (window.screen.height / 2 - cssAsNum(imgStyle.height) / 2) + "px";
    };
    
    if(img.complete) {
        img.onload();
    }
})();

qr.js

(function($) {
    var img,body;
    img = $('<img style="user-select: none;position:fixed;z-index:999999" src="http://chart.googleapis.com/chart?cht=qr&amp;chs=150x150&amp;chl=' + escape(window.location.href) + '">');
    body = $(document.body);
    img
        .prependTo(body)
        .hide()
        .click(function() {
            img.fadeOut(function(){
                img.remove();
            })
        })
        .on("load", function() {
            img.show().css({
                left: $(window).width()/2 - img.width()/2,
                top: $(window).height()/2 - img.height()/2
            })
        });
        if(img.prop("complete")) {
            img.load();
        }
})(jQuery);

Wow, thank you for this beautiful code.
I tested the plugin but wanted to request if you could assist me for a way to place the QR at the Top Left side around the area proportion of 30% if we should determine center is at 50%
As yes the center is right, but on my end, it gets hidden due to the reason that I already use another element at the center
Could you kindly share areas a code could use at the child theme to resolve it

Thanks in advance