Contents background image?

Scripture App Builder
1

Does anyone know if it’s possible to set a background image for the contents pages? Not the book/chapter/verse selector dropdown, but the contents. I know we can add pictures beside the links on the contents page, but it would be wonderful if there was a way to add a background image.

I tried using css in the styles page to:

  1. background-image: url('images/bg-image.jpg')
    and
    2 using bnackground-image with url encoded svg text. (this worked when previewing the contents menu in the browswer and in SAB, but did not work in the app once it wqas build.

I assume 1. should work if I knew what the correct url would be for an image added in the illustrations section.

Any ideas? Is this possible at the moment?

Our app is being built for Android 4.4 and higher.