3D FlipBook - Changing the textured background image on full screen

1. set the book background in Book Editor-> Book properties or use css:

   /*inline on page*/
   ._3d-flip-book .full-size.fullscreen {
   background-image: none;
   background-color: #f00;
   }
   /*All lightboxes*/
   .fb3d-modal.visible .mount-container.fullscreen {
   background-image: none;
   background-color: #f00;
   }
   

2. Insert twice:

   [3d-flip-book mode="fullscreen" id="2410"][/3d-flip-book]
   [3d-flip-book mode="link-lightbox" id="2410" classes="fb3d-auto-launch"][/3d-flip-book]
   

   instead of fb3d-auto-launch you can use share link, it also launches lightbox.

That's great thanks. If for 1 I simply want to change the image used as the background what would I do?

Add in your theme styles:

/*inline on page*/
._3d-flip-book .full-size.fullscreen {
background-image: url('http://example.com/image.png');
}
/*All lightboxes*/
.fb3d-modal.visible .mount-container.fullscreen {
background-image: url('http://example.com/image.png');
}