This theme is unmaintained.
A GitHub color-theme for Emacs
Download the file color-theme-github.el to the directory ~/.emacs.d/themes,
then add the following to your Emacs init file, e.g. ~/.emacs:
(add-to-list 'custom-theme-load-path "~/.emacs.d/themes/")
(load-theme 'github)
Please use GitHub to send pull requests or to report bugs in the issue tracker.
Cheers // Dudley Flanders