I just got around to stepping through checkout using Chrome. God help me when I get around to Edge.

Forum search did not yield any CHROME responsive_classic results
Google search did not yield any Chrome responsive_classic results

zc156c
responsive_classic cloned
built-in checkout process

Desktop
Checkout payment: FireFox appears as expected except box not drawn around payment expiration date
Checkout payment: Chrome formatting all fouled up. Box not drawn around payment expiration date

Boxes weren't drawn around a couple of places when I used the phone
I have not gone mucking around in any of the css files (that I know of)

Click image for larger version.  Name: ChromeCheckoutPayment.jpg  Views: 41  Size: 31.4 KB  ID: 18909Click image for larger version.  Name: FFcheckoutpayment.png  Views: 65  Size: 27.9 KB  ID: 18910