diff --git a/django_select2/forms.py b/django_select2/forms.py
index 5e2ea5fd..68be213f 100644
--- a/django_select2/forms.py
+++ b/django_select2/forms.py
@@ -146,14 +146,15 @@ def media(self):
 class Select2AdminMixin:
     """Select2 mixin that uses Django's own select template."""
 
-    css_class_name = "admin-autocomplete"
     theme = "admin-autocomplete"
 
     @property
     def media(self):
+        css = {**AutocompleteMixin(None, None).media._css}
+        css["screen"].append("django_select2/django_select2.css")
         return forms.Media(
             js=Select2Mixin().media._js,
-            css=AutocompleteMixin(None, None).media._css,
+            css=css,
         )
 
 
diff --git a/tests/test_forms.py b/tests/test_forms.py
index 4e148f7a..0b7c0af7 100644
--- a/tests/test_forms.py
+++ b/tests/test_forms.py
@@ -195,6 +195,7 @@ def test_media(self):
             "screen": [
                 "admin/css/vendor/select2/select2.min.css",
                 "admin/css/autocomplete.css",
+                "django_select2/django_select2.css",
             ]
         }