Excluding background image from parent div when draggable item is triggered

[T N]

I am finding a way to exclude a part of background image from parent div when draggable item is triggered.

This is the code :

'

• item

'

So when I drag the

, it included also background from

. Trying to remove with css but seems impossible.

Angular CLI: 6.2.8
Node: 10.0.0
OS: darwin x64
Angular: 6.1.10
Browser: Chrome