diff --git a/js/lab/src/theme/static/base.css b/js/lab/src/theme/static/base.css
index 42aa20f490..714313b45f 100644
--- a/js/lab/src/theme/static/base.css
+++ b/js/lab/src/theme/static/base.css
@@ -92,3 +92,7 @@
   border-color: var(--jp-widgets-input-focus-border-color);
   outline: none !important;
 }
+
+.hidden {
+  display: none !important;;
+}