function printReceipt(el) {
var w = window.open();
w.document.write('<html><head><title></title>');
w.document.write('<link rel="stylesheet" type="text/css" href="css/receipt-print.css">');
w.document.write('</head><body >');
w.document.write(document.getElementById(el).innerHTML);
w.document.write('<script type="text/javascript">addEventListener("load", () => { print(); close(); })</script></body></html>');
w.document.close();
w.focus();
}