You're right. Thanks for the hint! Will fix it.
Update 2018-04-28: Fixed it.

Hoi Doc Snyder,
thx for entertaining me/us with your cool browser versions of c64-scene history ^^

but this one is buggy: take a closer look at the space from the "S" for example. normaly the background raster should be seen,
but in your version the color of the rotating tubes stays there.

live long and prosper ;)