How to make a button with a transparent icon and a background under it?

Question

css

Probably a super stupid question, but I don’t understand how to make the icon transparent and the background just under it was also transparent. I have attached a photo of how it should be.

Answer 1

You here or similar resources where you can find a suitable icon: fontawesome.io/icon/check-circle
PS If you can't find it, you can always make a .png image.

Answer 2

background: transparent;