diff --git a/.changeset/salty-baths-buy.md b/.changeset/salty-baths-buy.md
new file mode 100644
index 0000000000..c3b72189eb
--- /dev/null
+++ b/.changeset/salty-baths-buy.md
@@ -0,0 +1,5 @@
+---
+'@backstage/ui': patch
+---
+
+Added a background color default on the body
diff --git a/.changeset/warm-dancers-call.md b/.changeset/warm-dancers-call.md
new file mode 100644
index 0000000000..62cdfb9baf
--- /dev/null
+++ b/.changeset/warm-dancers-call.md
@@ -0,0 +1,5 @@
+---
+'@backstage/theme': minor
+---
+
+**BREAKING**: Removed noCssBaseline prop in UnifiedThemeProvider.
diff --git a/packages/theme/report.api.md b/packages/theme/report.api.md
index ebdae12a05..18ac96ecec 100644
--- a/packages/theme/report.api.md
+++ b/packages/theme/report.api.md
@@ -459,8 +459,6 @@ export interface UnifiedThemeProviderProps {
   // (undocumented)
   children: ReactNode;
   // (undocumented)
-  noCssBaseline?: boolean;
-  // (undocumented)
   theme: UnifiedTheme;
 }
 ```
diff --git a/packages/theme/src/unified/UnifiedThemeProvider.tsx b/packages/theme/src/unified/UnifiedThemeProvider.tsx
index 45358c13da..d0886cd146 100644
--- a/packages/theme/src/unified/UnifiedThemeProvider.tsx
+++ b/packages/theme/src/unified/UnifiedThemeProvider.tsx
@@ -37,7 +37,6 @@ import { unstable_ClassNameGenerator as ClassNameGenerator } from '@mui/material
 export interface UnifiedThemeProviderProps {
   children: ReactNode;
   theme: UnifiedTheme;
-  noCssBaseline?: boolean;
 }
 
 /**