Can You Change The Background Image?

I am using Harlowe, and I'm wondering if you can import (or something) an image into your story and make it a background image. I know you can change the background to different colours, but I recently played 'The Uncle From Nintendo', where the background is an image instead of just a colour. I don't know which format they're using, but I would quite like to do this in the game that I'm working on. I have an image address, by the way:

https://pixabay.com/en/palmetto-bay-beach-roatan-1505474/

Thanks