--- a/src/pyams_portal/slot.py	Fri Mar 26 16:32:52 2021 +0100
+++ b/src/pyams_portal/slot.py	Thu Aug 05 09:27:48 2021 +0200
@@ -33,6 +33,7 @@
     slot_name = FieldProperty(ISlotConfiguration['slot_name'])
     _portlet_ids = FieldProperty(ISlotConfiguration['portlet_ids'])
     visible = FieldProperty(ISlotConfiguration['visible'])
+    container_css_class = FieldProperty(ISlotConfiguration['container_css_class'])
     xs_width = FieldProperty(ISlotConfiguration['xs_width'])
     sm_width = FieldProperty(ISlotConfiguration['sm_width'])
     md_width = FieldProperty(ISlotConfiguration['md_width'])