diff --git a/client/galaxy/style/scss/frame.scss b/client/galaxy/style/scss/frame.scss
index c31b086348d..6bbcd84b5f3 100644
--- a/client/galaxy/style/scss/frame.scss
+++ b/client/galaxy/style/scss/frame.scss
@@ -19,6 +19,7 @@ $frame-default-border: $border-color;
         height: 100%;
         width: 100%;
         opacity: 0.5;
+        background: $brand-dark;
         overflow: auto;
     }