Buttons checkout design

[Jay6680]

Hello,

I am building an app for my company. I have no coding experience so I'm using "Bubble" which allows people to build an app without coding. I want to allow users to choose how much they want to pay that's why I created a automatic billing button. The problem is that the checkout is not like the "BUY NOW" button that is responsive to mobiles. This means that it's really hard to fill out stuff when the page is not responsive. I know nothing about SKD's so I was wondering if it is possible to change the automatic billing checkout to something similar to the buy now ones. Or is there any other way I can allow users to choose how much they wanna pay without having a paypal account? The reason why I'm not using API's like Braintree or Stripe is because they are not supported in my country and I rather receive payments thru paypal. 

Thanks

Buy now checkout vs. automatic billing checkout