Advanced Theme Builder allows you to add background images to different elements of your popup.
Add designs you make in PhotoShop or Canva as your popup backgrounds. Use an image for the overlay behind the popup or even as the close button!
Create awesome effects by using .png images with transparency and tweaking the background overlay color and opacity itself.
This is the best feature to give your popups that extra something that keeps your users engaged as opposed to looking for the nearest close button.