Solution: White on Mint Green Code Color.
This question gets asked a lot lately so I thought I would put together a solution for anyone who is interested. Incidentally, it works the same for light or dark based code color themes.
Go to Edit > Preferences > Interface
Create a new theme. See screenshot below.
Name your new Theme.
Edit your new Theme.

At the bottom of your main.LESS file, add the following.
/* Custom code colors or overrides should start after this line */
.CodeMirror-matchingtag {
color: white !important;
background-color: navy !important;
}
Adjust color values to suit.
Save main.LESS file.
Close main.LESS file.
Go back to Preferences and Apply your newly created code Theme.

