What do you mean?

@alecnotalex (View Post)
I think he means how do you make spark fly.
@jens (View Post)
You don't make it fly, you cover the element carrying the spark the same as the background so you can't see the wire that the spark is on. Press b in the simulation to open the decoration tool to colour the element.

Which is usually 000000 (Hex) or 0 0 0 for you.