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+You must create a `RailsCasts` theme inside IntelliJ first. Do this in Settings > Editor > Colors & Fonts,
+select any existing scheme and click "Save As" and name the new scheme `RailsCasts`
+
+Close IntelliJ, then go to `~/Library/Preferences/IntelliJIdea12/colors` and there should be a `RailsCasts.icls` file
+which can be replaced with this one.