In this chapter, we learned a great deal about UI15 and UI16, as well as how to create custom themes using CSS UI properties. We also learned how to brand your instance for your company, which you can also use to sub-brand your dev and test instances an order to make sure they're different at a glance, to avoid making updates directly in prod by accident! We even learned about the CMS, the service portal, and how to style and customize them.