I’m Helen from Shopify Support. Welcome to the Community!
Customizing the background color of the form fields that you kindly shared in the screenshot above, is done from within your Theme Editor. Let me show you where to find it:
For your reference, we have a great Help Doc for the Debut Theme that is very useful when customizing your storefront. It contains all of the cool features of the theme, and shows how to edit each one.
Let me know if you have any more questions.
Helen | Social Care @ Shopify
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