How to change colours of progress bars

[Alfie_ca]

This may seem a silly question,
but I have real trouble seeing it, all just is blend to me.
How do I change the colours of progress bars?
Good example is Software manager installation progress bar.
(Foreground/background)
Light green on dark grey makes it impossible for me to see what is going on.
I see no reason to use those colours at all - even scroll bars have better contrast.
Any dark colour (if it must be green - or dark cyan or blue, or even dark purple) on lighter background would work much better.
Could go overboard fancy and turn it all green when done.
Please, do consider to add this option for future update.
Thank you for your consideration.

[Beerislife]

Change the Controls theme in Settings to Mint-Y-Blue or Mint-Y-Teal or whatever theme takes your fancy. I use Mint-Y-Red with red icons and dark red Desktop theme.