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Hello E., and all,
Perhaps because this theme should be used by dark background, as:
If that can help,Regards.
Then if you want use on light background, you can add some style after theme command, as:
!theme spacelab <style> arrow { FontColor black } footer { FontColor black } </style>
Here is the expected result:
And finally, there is this not-very-documented feature which works only for FontText:
FontColor ?black:orange
The fontcolor is choosen depending on the background.
Black backgroundWhite background
We should probably update themes with this feature.
Good... To be add to the todo list of theme enhancement...
Regards.