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Re:GitHub changes topbar to dark theme by kapuru on Friday February 10, 2017 @03:06PM (#13618425)
Before everybody goes crazy. You can change the header to the light version again by going into your Settings -> Design.

Some people are still missing this option in their settings, but it will show up soon.

Re:GitHub changes topbar to dark theme by lorenzhs on Friday February 10, 2017 @03:39PM (#13618683)
Source? The screenshot in that one tweet was fake ("a mock-up"), as the author themself stated.