diff --git a/__fixtures__/test-project-rsc-kitchen-sink/web/src/layouts/NavigationLayout/NavigationLayout.css b/__fixtures__/test-project-rsc-kitchen-sink/web/src/layouts/NavigationLayout/NavigationLayout.css
index 670ce4ab53ef..a39971978dad 100644
--- a/__fixtures__/test-project-rsc-kitchen-sink/web/src/layouts/NavigationLayout/NavigationLayout.css
+++ b/__fixtures__/test-project-rsc-kitchen-sink/web/src/layouts/NavigationLayout/NavigationLayout.css
@@ -51,5 +51,9 @@
   & > main {
     display: flex;
     flex-grow: 1;
+
+    & > div {
+      width: 100%;
+    }
   }
 }