Make the solid colour transparent, I should say. Click on the black bar and set the opacity to 0. If that doesn't do the trick go the outside colouring and set the opacity of the solid color there too at 0. Sometimes the outside colouring has another "color"bar somewhere, so check that as well. And if that's not enough maybe it's in the inside colouring. Anyway: check the solid color for it's opacity. Good luck. Yvonne