The dark mode is a new color theme joining the classic GitHub light mode developers have been using for years. It is exciting for developers that dark mode has (finally) arrived in a public beta.
During the public beta, dark mode is available to all GitHub users without the need to sign up or join a waitlist. To select your preferred theme, simply navigate to your profile settings, click on the new “Appearance” tab, and choose between matching your system preferences, dark and light modes.
is GitHub dark yet ?
GitHub Post on dark mode