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I prepared a short talk on writing maintainable and extensible CSS for the first Ljubljana Webcamp. The event happened in april 2014, you can check out videos of all the talks that were given or at least take a quick look at mine. It’s about applying OOCSS/SMACSS philosophies and using Sass with Compass to make your code cleaner and easier to maintain and extend.
EDIT: Their website has since been taken down, so I dug up the slides from my personal archive.