After creating your lightbox (inline, banner, sidebar, etc), you may want to design the lightbox to have a background image.

This can be done by navigating to the “Boxes” tab at the top navigation in your account:

Select “Preview”, then “Editor”:

On the page that you would like the background image:

• Be sure you are on the “Layout” tab
• Scroll down to the “Background” section
• Toggle “Use Image”
• Add image by finding it on the list or adding it by clicking “Add Image”
• Preview your image
• Save the page