How to customize email signup box CSS on footer of blog

How do I find or edit the CSS for the email signup text box on blog posts for Casper theme?

I see that you can edit the text in the settings, but I would also like to change the background color. I assume I can inject code into the header - I just dont know what this element is called.

website here

You can overwrite the background color, targeting the footer-cta class:

<style>
.footer-cta { background-color: #7031dd; }
</style>

Here is the relevant code section:

Worked like a charm. THANK YOU

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