Setting the background color for inivisible whitespace

Hello, all

I need help tweaking SciTE that is shipped with the Lua
distribution preconfigured for that language.  Whatever I
do, I cannot set the background of the invisilbe (normal)
whitespace.  I have successfully set the background for all
text via the `back' subvalue of font.base in my
SciTEUser.properties, but the whitespaces remains stark
black.

By way of experiment, I have tried all of the following, but
to no avail:
                  font.base=back:#202020
                  style.*.32=$(font.base)
                  style.*.33=$(font.base)
                  style.*.34=$(font.base)
                  style.*.35=$(font.base)
                  style.*.36=$(font.base)
                  style.*.37=$(font.base)
                  style.*.*=$(font.base)
                  whitespace.fore=#202020
                  whitespace.back=#202020

The whitespace background is #000000.  What else can I try?
Can the Lua configuaration in  SciTEGlobal.properties be the
culprit?  Here it is:

            <https://pastebin.com/raw/v8wCzaZv>?

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