diff --git a/core/modules/system/system.libraries.yml b/core/modules/system/system.libraries.yml
index 9493f52..c94dfd9 100644
--- a/core/modules/system/system.libraries.yml
+++ b/core/modules/system/system.libraries.yml
@@ -23,14 +23,9 @@ base:
       css/components/action-links.theme.css: { weight: -10 }
       css/components/breadcrumb.theme.css: { weight: -10 }
       css/components/button.theme.css: { weight: -10 }
-      css/components/collapse-processed.theme.css: { weight: -10 }
-      css/components/container-inline.theme.css: { weight: -10 }
-      css/components/details.theme.css: { weight: -10 }
       css/components/exposed-filters.theme.css: { weight: -10 }
       css/components/field.theme.css: { weight: -10 }
-      css/components/form.theme.css: { weight: -10 }
       css/components/icons.theme.css: { weight: -10 }
-      css/components/inline-form.theme.css: { weight: -10 }
       css/components/item-list.theme.css: { weight: -10 }
       css/components/link.theme.css: { weight: -10 }
       css/components/links.theme.css: { weight: -10 }
@@ -43,7 +38,6 @@ base:
       css/components/tabledrag.theme.css: { weight: -10 }
       css/components/tablesort.theme.css: { weight: -10 }
       css/components/tabs.theme.css: { weight: -10 }
-      css/components/textarea.theme.css: { weight: -10 }
       css/components/tree-child.module.css: { weight: -10 }
 
 admin:
diff --git a/core/themes/classy/classy.libraries.yml b/core/themes/classy/classy.libraries.yml
index af0f891..c1245cf 100644
--- a/core/themes/classy/classy.libraries.yml
+++ b/core/themes/classy/classy.libraries.yml
@@ -2,6 +2,12 @@ base:
   version: VERSION
   css:
     theme:
+      css/components/collapse-processed.css: { weight: -10 }
+      css/components/container-inline.css: { weight: -10 }
+      css/components/details.css: { weight: -10 }
+      css/components/form.css: { weight: -10 }
+      css/components/inline-form.css: { weight: -10 }
+      css/components/textarea.css: { weight: -10 }
       css/layout.css: {}
 
 book-navigation:
diff --git a/core/modules/system/css/components/collapse-processed.theme.css b/core/themes/classy/css/components/collapse-processed.css
similarity index 100%
rename from core/modules/system/css/components/collapse-processed.theme.css
rename to core/themes/classy/css/components/collapse-processed.css
diff --git a/core/modules/system/css/components/container-inline.theme.css b/core/themes/classy/css/components/container-inline.css
similarity index 100%
rename from core/modules/system/css/components/container-inline.theme.css
rename to core/themes/classy/css/components/container-inline.css
diff --git a/core/modules/system/css/components/details.theme.css b/core/themes/classy/css/components/details.css
similarity index 100%
rename from core/modules/system/css/components/details.theme.css
rename to core/themes/classy/css/components/details.css
diff --git a/core/modules/system/css/components/form.theme.css b/core/themes/classy/css/components/form.css
similarity index 100%
rename from core/modules/system/css/components/form.theme.css
rename to core/themes/classy/css/components/form.css
diff --git a/core/modules/system/css/components/inline-form.theme.css b/core/themes/classy/css/components/inline-form.css
similarity index 100%
rename from core/modules/system/css/components/inline-form.theme.css
rename to core/themes/classy/css/components/inline-form.css
diff --git a/core/modules/system/css/components/textarea.theme.css b/core/themes/classy/css/components/textarea.css
similarity index 100%
rename from core/modules/system/css/components/textarea.theme.css
rename to core/themes/classy/css/components/textarea.css