-#civicrm-menu li.crm-menu-border-bottom:not(:last-child) {
- border-bottom: 1px solid #bbb;
-}
-#civicrm-menu li:not(.crm-menu-border-bottom) + li.crm-menu-border-top {
+#civicrm-menu li.crm-menu-border-bottom + li,
+#civicrm-menu li + li.crm-menu-border-top {