diff --git a/esp/src/eclwatch/css/hpcc.css b/esp/src/eclwatch/css/hpcc.css
index 3f4e182e181..d979c113288 100644
--- a/esp/src/eclwatch/css/hpcc.css
+++ b/esp/src/eclwatch/css/hpcc.css
@@ -1822,7 +1822,7 @@ span.dijitReset.dijitInline.dijitIcon.fa.disabled {
 }
 
 .flat:has(.fui-FluentProvider) .dijitPopup {
-    background-color: var(--white);
+    background-color: var(--white, white);
 }
 
 .flat-dark:has(.fui-FluentProvider) .dijitPopup {