Color Scheme similar to one from Sublime-Text: Monokai++ (https://github.com/dcasella/monokai-plusplus).
This version uses original "red" color for selection backgound. If you prefer green selections then use "sibling" color scheme: https://www.pling.com/p/1310934/
1. Open System Settings via KDE Application Launcher or from shell (systemsettings5)
2. Open Appearance / Colors
3. Click "Get new theme" button
4. Type "Monokai" in the search box
5. Click "Install" button for this addon