diff --git a/openslides/utils/forms.py b/openslides/utils/forms.py
new file mode 100644
index 000000000..ad0def6d8
--- /dev/null
+++ b/openslides/utils/forms.py
@@ -0,0 +1,3 @@
+class CssClassMixin(object):
+    error_css_class = 'error'
+    required_css_class = 'required'