QR Codes Printing too small

[Morphzan]

Hi All

I am having an issue with QR code printing. I am using a Zebra GK420d Printer, my labels are 30x15mm

I have my 30x15mm labels configured correctly (As far as I can see in the printer settings) , but the QR code is too small. How can I edit the CSS or template to make the QR code fill more of the label or am I missing something?