Backside and settings have high z-index

Since resize handles underneath were interfering.
Switched from mouseenter to mouseover

And mouveleave to mouseout. Read
https://developer.mozilla.org/en-US/docs/Web/Events/mouseenter
Replaced Remove button with close button

And close button auto-hides now.
Close button appears only when appropriate

Not in conditions for example.
Improved placement of close button