diff --git a/ui2/src/index.css b/ui2/src/index.css
index 59825435f..0c2c3b107 100644
--- a/ui2/src/index.css
+++ b/ui2/src/index.css
@@ -66,7 +66,7 @@ body {
   padding-top: 1rem;
   display: flex;
   flex-direction: column;
-  background-color: #f9f9f9;
+  background-color: light-dark(#f9f9f9, black);
   flex-grow: 1;
 }