Somebody managed to change the Color of the Login button in new StoreFront UI with 2503?

There is no way to do this as the moment. The accent colour applies to most buttons but not on the log in screen. We are aware of this limitation and it might be fixed in a future release.

Thanks Jonathan.

That's interesting. I had a customer-RFE for the login-button color. I got the confirmation it should work with 2503, so it's now delayed?

Some buttons were updated in 2503 but not the log in button.