try like this
function PrintContent() {
var DocumentContainer = document.getElementById('divPrint');
var WindowObject = window.open('', 'PrintWindow', 'width=750,height=650,top=50,left=50,toolbars=no,scrollbars=yes,status=no,resizable=yes');
var strHtml = "<html>\n<head>\n<link rel=\"stylesheet\" type=\"text/css\" href=\"print.css\">\n</head><body><h4>\n<div style=\"testStyle \">\n" + DocumentContainer.innerHTML + "\n</div>\n</body>\n</html>";
WindowObject.document.writeln(strHtml);
WindowObject.document.close();
WindowObject.focus();
}
where print.css is the stylesheet containing your style for the page.Modify your stylesheet accordingly
Try this