Browsers Are Hi-jacking the CSS

The lightbox preview is absolutely perfect. But when it’s actually printed, it looks nothing like the lightbox preview.

Chrome kills the three-column layout.

Firefox doesn’t honor the page breaks.

Please help.

http://www.relishrelish.com/test-printable-shopping-list/

Yes, JS is enabled in the admin area.
Yes, I am using a custom CSS and have the URL entered in the admin area.

Thanks!

https://wordpress.org/plugins/printfriendly/