Hi there goldenideasforyou,
When it comes to issues like this, I’m going to be a bit limited in what I can provide, especially when working with this particular plugin, which is going to be a lot tricker to manipulate for an overlay. I’m not able to provide any custom coded solutions here but I’ll be happy to make some suggestions to get you going.
In a situation where you are wanting to achieve a specific layout in the overlay, I’d first recommend using the MailChimp embed form code rather than the plugin, due to the increased flexibility provided by the simpler form action code.
– Add a Signup Form to Your Website: https://eepurl.com/gOGN
From there, checking out resources like this one should help you get going in the right direction:
– https://stackoverflow.com/questions/21395662/overlay-div-on-image
– https://stackoverflow.com/questions/1183633/can-you-overlay-a-transparent-div-on-an-image
– https://stackoverflow.com/questions/20930915/how-to-overlay-a-form-field-over-an-image-with-a-fixed-width
Let me know if there’s anything else I can help out with regarding this plugin specifically, and hopefully the links above are helpful for you!
-Kath