Hey, I’m at a stage of review where Shopify mentioned this:
Update your app block so that it inherits styling properties from the theme, such as typography and colors. Refer to this help document (https://shopify.dev/apps/online-store/theme-app-extensions/ux-guidelines) and see this screencast for context.
Some ideas I’ve had include doing a style like this:
.some-class {
background: inherit;
}
I also have the option to allow customers to manually change background color in the theme editor.