OK Barbara I've got good news and bad news
The bad news is that I've tried
countless things and couldn't get this hack to work.
The good news is that Ozzy's
other hack (
which is very similar)
does work.
I couldn't get the image to center so I had to use a larger transparent background, but I'm still working on the CSS part. Then a smaller image can be used. Still looking into why the other hack isn't playing nice. I'm sure someone here will narrow it down sooner or later. Just takes a bit of time.
Here is the image I'm using until I can get the centering to work: