If you're talking about our standard sign-up form we provide under List Growth Tools then at this time we are not able to adjust how the confirmation box appears. It's a great idea and I will make sure to track it as feedback in your account for our developers to see.
You are able to change the background color and the font color of the overall form but it won't impact the confirmation box.
You might be able to find a third-party sign-up form on our Marketplace that integrates with Constant Contact.
View API documentation, code samples, get your API key.
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