Update shape color names in content

development/architecture/introduction.md

@@ -43,9 +43,9 @@ Like most traditional web applications, PrestaShop is heavily **Database**-drive
 In the figure above, the database has been placed a little outside the diagram to point out to the fact that it's a system of its own that could be on a separate server, in a cluster, etc.
 {{% /notice %}}
 
-The purple cloud depicted above the Database is what we call the **Core Business**. It's the big ensemble of code that manages what makes PrestaShop PrestaShop, also referred as "business logic". It includes models, controllers, helper classes, and the like.
+The black cloud depicted above the Database is what we call the **Core Business**. It's the big ensemble of code that manages what makes PrestaShop PrestaShop, also referred as "business logic". It includes models, controllers, helper classes, and the like.
 
-PrestaShop controllers will generally output HTML pages, but on some cases they can output JSON or even XML. The structure of those pages is defined by **Themes** (depicted as pink blocks overlapping both the front-end and the back-end), which transform controller-provided data into HTML. This is true both for the FO and BO.
+PrestaShop controllers will generally output HTML pages, but on some cases they can output JSON or even XML. The structure of those pages is defined by **Themes** (depicted as white blocks overlapping both the front-end and the back-end), which transform controller-provided data into HTML. This is true both for the FO and BO.
 
 Although PrestaShop 8 is bundled with default themes for FO and BO, only the FO supports third-party themes.