reverted:
--- b/core/modules/field/theme/field.css
+++ a/core/modules/field/theme/field.css
@@ -26,9 +26,3 @@
 form .field-add-more-submit {
   margin: .5em 0 0;
 }
-
-/* Fieldset variant */
-fieldset.fieldset-no-border {
-  border: none;
-  padding: 0;
-}
only in patch2:
unchanged:
--- a/core/modules/field_ui/field_ui.admin.css
+++ b/core/modules/field_ui/field_ui.admin.css
@@ -66,3 +66,9 @@
 .field-ui-overview .field-formatter-settings-edit-form .formatter-name{
   font-weight: bold;
 }
+
+/* Fieldset variant */
+fieldset.fieldset-no-border {
+  border: none;
+  padding: 0;
+}