[scruffs]

Please forgive if this is not the correct forum.

I am trying to target the background mode on Apple Books in CSS.

I can get sepia working with:

:root[__ibooks_internal_theme*="Sepia"]
div.thing {
background-color : #ffff00;
}

but I cannot get Night or Gray working with:

:root[__ibooks_internal_theme*="Night"]
div.thing {
background-color : #00ffff;
}


Info on the web seems to indicate that it should work.

:-/