Documentation:
Image Box

Here you can add custom CSS.

Main Element

Here you can add custom CSS for the main module.

Image

Here you can add custom CSS for the image.

Text

Here you can add custom CSS for the image text area.

Title

Here you can add custom CSS for the image title text.

Caption

Here you can add custom CSS for the image caption text.

Other settings here are common to most Divi modules and are not discussed further. For more information on common Divi module settings, please consult the Elegant Themes Documentation.