Success message background displaying with style of Error message background

Hi there,

its a Success by default.

You have this CSS in the Customizer > Additional CSS which is overriding the customizer colors:

.woocommerce-error,
.woocommerce-info,
.woocommerce-message {
	border-left: 0px solid rgba(0, 0, 0, 0);
	font-size: 16px;
	margin: 1em 0 2em 0;
	background-color: #b92733;
}

Remove that background-color to fix that.

Which of those is the success message?

Does this help?
https://www.screencast.com/t/YUxVySmWk0Lh

Yes, thank you.

No problem :)