Gordon, dunno what you did when you printed them out, but the stickers I ordered from Sticky Life (no comments, please) have a white background and look like this on the windshield:
BTW, if you're ordering directly from Sticky Life (no comments, please), you SHOULD specify 'clear background' so that the outer margin of sticker (outside the round design area) is clear. You can see a small, maybe 1/8" wide ring of clear vinyl on the outer edge.
The clown design I submitted has white, opaque color in the clown face, behind the lettering, etc.