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I am not sure what you mean exactly, so I will give you several different CSS codes and you can see here how to apply them to your jotforms.
1st CSS code
- It will change the entire background behind the Stripe form
- It will change the entire background color right behind the Stripe form payment
Now if you want to change the error background color you can do that using this CSS
If neither of those is what you wanted to accomplish please let us know.
You can see the jotform with the styles applied here: http://form.jotformpro.com/form/42874812388971
I intentionally gave it different colors so that you can see which background color you wanted to have set.
Do let us know if you have any further questions.