How to change CSS for Signup portal of Subscribe?

I would like to change CSS for some of the components in the signup/login popup so it matches with my dark theme.


I tried code injection, but it is not working. How can I change it?

    	color: #ee7169 !important;

        background-color: #5e5e9a !important;

I think that’s controlled by the accent color you have in brand settings