It's really not that bad, you should give it a shot.
Basically, all you need is to give your popup a recognizable id, let's say "accordion"
Then in your stylesheet, you add this:
.ia_popup[id=popup-accordion] {
background-color: transparent;
border: None;
box-shadow: None;
}
.ia_popup[id=popup-accordion] .body-wrapper {
overflow: visible;
}
Maybe put some border/background on the view root (not even necessary), and you're done.