[BUG] Responsive design for certain phones make button unclickable

[jameszu]

Describe the bug
Responsive design for certain phones is bad in the process payment page
Cannot click the process to payment button because of the back button and stuff, more in the screenshot below

To Reproduce
Go to the payment selection page

Expected behavior
The user is able to click the process button instead of a back button : (

Screenshots

Cannot scroll at all