David H. Durgee composed on 2017-12-06 14:32 (UTC-0500):

> I do have a GTK3 customization file of my own to deal with the missing 
> scroll steppers as you do.  Is there an override to add here as well 
> that will address the invisible checkbox/radio button problem?            

Ultimately that could be a place for a solution, but not the only place, nor the
ideal place. Another possibility would be your profile's chrome/userChrome.css
file, which you probably do not have, since by default it does not exist.

Are you using either of the built-in SM themes, default classic or modern, and
tried the other?

> Perhaps someone who knows GTK3 customization can solve this for me.

That would be the ideal magic, but finding such a person with the interest to do
so is another matter.

Things I would try first if I was using Mint 18.2 with Cinnamon:

1-upgrade to 18.3
2-add Mate to see if the problem exists there also
3-if it does not, go back to Cinnamon and see if something Mate added solved it
4-if still a problem in Cinnamon, try yet another DE, e.g. KDE or XFCE
5-repeat 3
6-if still a problem in Cinnamon, search and/or ask in a Cinnamon or Mint users
forum, e.g. https://www.linuxquestions.org/questions/linux-mint-84/ or
https://forums.linuxmint.com/viewforum.php?f=208

Absent finding someone or some group who can help with CSS customizaton, either
using ~/.config/gtk-3.0/gtk.css or profile's chrome/userChrome.css, you might
try DIY with Domi (SM's Tools -> Web Development ->). The highlight in the left
pane of http://fm.no-ip.com/SS/Moz/sm2491domi-samp.gif shows on the right side
the CSS rules being applied to that element, and you can see btn-color is being
inherited. The hard part is figuring out what overriding rule(s) is/are required
to ensure visible colors get inherited. That's why the much better method is
finding someone who understands GTK3 theming who can ID and suggest a solution
to the root problem, bad or missing theming.
-- 
"Wisdom is supreme; therefore get wisdom. Whatever else you
get, get wisdom." Proverbs 4:7 (New Living Translation)

 Team OS/2 ** Reg. Linux User #211409 ** a11y rocks!

Felix Miata  ***  http://fm.no-ip.com/
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