I was looking  for a Popup plugin that i could use for a form that worked nicely with Divi theme, but i wanted it to use the standard divi form as i find it simplicity useful.

and i found Popups for Divi.

• Last updated: 2 months ago
• Active installations: 6,000+

And it works pretty nicely.

The instructions aren’t exactly clear, to me anyway. So here are my instructions to myself:

1. Add a row to the page you want a popup on and set the ID to “newsletter-optin” and CSS class to “popup” in Advanced tab of row
2. Add a form to the row 
3. Add #newsletter-optin to the link on the page
4. Save and test and style
5. Save it as Global if you want to add it to lots of pages.

its its nicely responsive.