diff --git a/packages/core-components/src/components/DismissableBanner/DismissableBanner.tsx b/packages/core-components/src/components/DismissableBanner/DismissableBanner.tsx
index 186f38a111..9b74b1e9b8 100644
--- a/packages/core-components/src/components/DismissableBanner/DismissableBanner.tsx
+++ b/packages/core-components/src/components/DismissableBanner/DismissableBanner.tsx
@@ -64,17 +64,17 @@ const useStyles = makeStyles(
       width: '100%',
       maxWidth: 'inherit',
       flexWrap: 'nowrap',
+      color: theme.palette.banner.text,
     },
     message: {
       display: 'flex',
       alignItems: 'center',
-      color: theme.palette.banner.text,
       '& a': {
         color: theme.palette.banner.link,
       },
     },
     button: {
-      color: theme.palette.banner.closeButtonColor,
+      color: theme.palette.banner.closeButtonColor ?? 'inherit',
     },
     info: {
       backgroundColor: theme.palette.banner.info,
diff --git a/packages/theme/api-report.md b/packages/theme/api-report.md
index 60566266c7..863ab81b68 100644
--- a/packages/theme/api-report.md
+++ b/packages/theme/api-report.md
@@ -70,7 +70,7 @@ export type BackstagePaletteAdditions = {
     error: string;
     text: string;
     link: string;
-    closeButtonColor: string;
+    closeButtonColor?: string;
     warning?: string;
   };
 };
diff --git a/packages/theme/src/types.ts b/packages/theme/src/types.ts
index ff5dce9e8b..0295e491f1 100644
--- a/packages/theme/src/types.ts
+++ b/packages/theme/src/types.ts
@@ -85,7 +85,7 @@ export type BackstagePaletteAdditions = {
     error: string;
     text: string;
     link: string;
-    closeButtonColor: string;
+    closeButtonColor?: string;
     warning?: string;
   };
 };