Change the color scheme
gedit includes several different color schemes, allowing you to change the appearance of the main text area.
To change the color scheme:
Press the menu button in the top-right corner of the window and select Preferences ▸ Font & Colors.
Choose your desired color scheme.
The new color scheme will be applied immediately.
Use a Custom Color Scheme
You can also use color schemes that have been created by others, or create and use your own color schemes. See the libgedit-gtksourceview documentation.