I expected the phone version to use the full screen. (It's probably a night mare because each phone has a different size, but they are pretty close to the card ratio.)
I missed the part about embedding. It is in https://webtiles.co/ but it is not clear in your examples.
Mobile phone view as requested
https://pasteboard.co/Jjr0Jjz.jpg
Webtile can be easily embedded in blogs and other articles like in the screenshot below
https://pasteboard.co/JjqZ8GD.jpg