@regularlabs Compiling the css can be done on a git clone with npm e.g. with command npm run build:css. See here for more information: https://docs.joomla.org/J4.x:Setting_Up_Your_Local_Environment/en. This has to be done for testing this PR. The compiled css is not maintained in git but will be compiled again when doing a (e.g. nightly) build.
PS: This only fixes the scss file. I'll leave the compiling to css to you guys.