diff --git a/packages/core/src/components/DismissableBanner/DismissableBanner.tsx b/packages/core/src/components/DismissableBanner/DismissableBanner.tsx
index 7190ee8725..b7a36c8b98 100644
--- a/packages/core/src/components/DismissableBanner/DismissableBanner.tsx
+++ b/packages/core/src/components/DismissableBanner/DismissableBanner.tsx
@@ -31,6 +31,7 @@ const useStyles = makeStyles((theme: Theme) => ({
     marginTop: -theme.spacing(3),
     display: 'flex',
     flexFlow: 'row nowrap',
+    zIndex: 'unset',
   },
   icon: {
     fontSize: 20,