How to change Mollie styles in Shopware 6?
The code is in an iframe, you cannot change it directly.
But if you look at the src of the iframe, the Moolie server accepts parameters for the background color. This can theoretically be changed from Shopware 6 side by adapting the module. (see https://docs.mollie.com/components/styling)
Anyways, the Mollie module does not seem to use the standard error color from the Theme. I would consider this a shortcoming / bug in the module and recommend you try to report it to the module vendor.
