Order summary component solution with HTML and SCSS

This is my solution for the Order Summary Component challenge.

• Feel like the solution could've turned out better so I might do some improvements soon.
• Had to turn the 'Proceed' and 'Cancel' buttons into <a> tags otherwise the styles would get messed up. Was their a way to overcome this issue?
• I also would love to know if there are any good practices for mobile responsive design I should start implementing? I always feel like I don't do much for it. Do you use max-width or min-width and what 'px' do you use for each?

I'm happy to hear any feedback and advice to help me improve! Thank you!