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The new 2.60 version of Open Atrium includes a brand new theme. By default this theme is only enabled for new installations. To use this theme on an existing Atrium site (upgrading), you need to perform a couple of extra steps:
Sass is an amazing and feature-rich way you create your site's stylesheet. You can learn more about it on the Sass website. Some of the Sass features that Omega utilizes out of the box include:
Mixins
These are styling functions and include omegaShadow, which when included in a style will automatically add a standardized box shadow. And omegaCorners which allows you to easily add a border radius using a variable like this:
Omega 5.x comes with two starterkits: Omega Default, which comes with a large set of customizable regions, and Omega Clean, which is the simpler starterkit and offers a more limited set of default regions. To use either copy it from the Omega directory to your base themes directory. For example from sites/all on the command line when starting from Omega Default:
cp -a themes/omega/starterkits/omega_default/ themes/your_subtheme_machine_name