Change record status: 
Project: 
Introduced in branch: 
11.5.x
Introduced in version: 
11.5.0
Description: 

CSS files in system module's 'base' library have been moved from 'component' to 'base'.

Themes or modules that alter or override the system/base library definition may need to update for the new library definition.

Impacts: 
Module developers
Themers