one-dark-syntax Bundled A dark syntax theme atom 287,459 73 1.8.4 MIT GitHub Share Package Link MarkDown Link Iconic MarkDown Link One Dark Syntax theme The font used in the screenshot is Fira Mono. There is also a matching UI theme. Install This theme is installed by default with Atom and can be activated by going to the Settings > Themes section and selecting it from the Syntax Themes drop-down menu.