Remove Signup Form Background

Hi,

I’m new to Mailpoet but I like this email plugin and its functionalities. I’m trying to customize the style of my signup form so I can insert it in the footer of my website.

However, I have a big problem. I am unable to remove the background so the form appears with a white background (my footer is grey).

Can I use some custom CSS to remove the background? Is there some way to remove it or change its color?

Thanks