In the Customization > Popup design section, you can customize the popup style and close icon options.

Style options
- Popup size (px): set the popup width and height in pixels. This is the maximum size. If the content does not take the full space, the popup will be automatically shrunk.
 - Popup animation: choose here the popup animation effect among the following: 
- fade in
 - slide in (left)
 - slide in (right)
 - slide in (top)
 - slide in (bottom)
 - 3D flip (vertical)
 - 3D flip (horizontal)
 - scale up
 
 - Overlay color: set the overlay color and opacity.
 - Border radius: set the popup border radius for each corner.
 
Close icon
- Show close icon: enable to show the close icon on the popup.
 

- Icon color: set the colors of the close icon, default and on hover.