How do you designed the checkout page on your demo site for Bopo?

Hello,

on you demo site (https://demo.villatheme.com/home-5/checkout/) is a well designed checkout page. How do you created this? On my website the checkout page with bopo items inside the cart looks not good. Specially on mobile its not good to use.

Did you used a plugin to let it look like this?
Please let me know. Thank you very much!

Best Regards
Fabio