Removing all 'stable' theme's CSS from a Drupal 8 custom theme I would like to remove all CSSs automatically included from stable theme:

/core/themes/stable/css/system/components/*


I can remove them one by one inside the .info.yml file:

stylesheets-remove:
  - 'core/themes/stable/css/system/components/ajax-progress.module.css'
  - 'core/themes/stable/css/system/components/autocomplete-loading.module.css'
  - ...


Is there a way to remove all of them at once? 

Something like:

stylesheets-remove:
  - 'core/themes/stable/css/system/components/*'
There's no wildcarding for the stylesheets-remove (FYI: there's a FR out there for it). However, you can use libraries-override to remove the library associated with the all CSS components you've highlighted:

libraries-override:
  system/base: false


It won't remove all CSS files in the stable theme, but it will condense removal of libraries that contain many CSS files.