Using Zip files for themes
http://www.javascripter.net/faq/rgbtohex.htm
https://www.rapidtables.com/web/color/green-color.html
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on mac: Arduino.app/Contents/Resources/Java/lib/theme/theme.txt
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on Win7: C:\Program Files\Arduino\lib\theme\theme.txt
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on Linux: .../arduino-1.6.3/lib/theme/theme.txt
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on Windows 10: when installed as an App, C:\Program Files\WindowsApps\ArduinoLLC.ArduinoIDE_1.8.10.0_x86__mdqgnx93n4wtt\lib\theme\theme.txt, however it does not seem possible to edit it - it can be opened in notepad++ but a save fails.
Using zip application create a zip file containing the original theme.txt found in the location of your operating system. call it theme.txt.original.zip
Now modify the theme.txt file for colors, font sizes, etc using zip application create a zip file containing the edited theme.txt found in the location of your operating system. call it theme.txt.custom.zip
In the Arduino IDE goto the menu Arduino-->preferences under the option theme select theme.txt.custom.zip from the drop down list and restart Arduino IDE and the custom theme will take effect.
Copy the theme.txt.custom.zip file to a safe location so it will be available when there is an upgrade or reinstallation.
changed console.font to 18 changed console.error.color to #7CFC00 - lawngreen
# GUI - CONSOLE
console.font = Monospaced,plain,11
console.font.macosx = Monaco,plain,18
console.color = #000000
console.output.color = #eeeeee
# original orange #E34C00
# lime green #BFFF00
# lawngreen #7CFC00
console.error.color = #7CFC00
changed editor.comment2 to #434F54,bold - dark grey and bold
# TEXT - COMMENTS
editor.comment1.style = #434F54,bold
editor.comment2.style = #434F54,bold
Increased linestatus.font to 14 increased linestatus.height to 30
# LINE STATUS - editor line number status bar at the bottom of the screen
linestatus.font = SansSerif,plain,14
linestatus.height = 30
More info https://github.com/per1234/ThemeTest you could also copy the attached file to the theme directory theme.txt_visually_improved pacav.zip