Themes for the Xojo IDE
The Xojo IDE allows you to change the colors and font of the code editor in groups (or themes). You might want to have one theme for the daytime and a different one for the evening.
I recommend the Solarized Dark and Sunset themes to get you started.
These themes are compatible with both the Xojo IDE itself and with the XojoThemes app, which may be of use to you if you change themes regularly. XojoThemes can be downloaded from https://www.libertyapp.com/xojothemes/XojoThemes.zip