Question about ksudoku themes

[Chris]

I'm messing around with making my own theme for ksudoku, and I'm running into a problem.  I want to make the number grid fully opaque so the background can be seen around it, but not behind it.  Is there a way to do that and keep the highlighted row and column visibly highlighted?  I tried making the individual number square opaque, but that hides the red highlights.
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