diff --git a/geneit_app/src/widgets/BaseFamilyRoute.tsx b/geneit_app/src/widgets/BaseFamilyRoute.tsx
index 5489118..f18ed54 100644
--- a/geneit_app/src/widgets/BaseFamilyRoute.tsx
+++ b/geneit_app/src/widgets/BaseFamilyRoute.tsx
@@ -105,10 +105,7 @@ export function BaseFamilyRoute(): React.ReactElement {
               component="nav"
               sx={{
                 minWidth: "280px",
-                backgroundColor: (theme) =>
-                  theme.palette.mode === "light"
-                    ? theme.palette.grey[100]
-                    : "background.paper",
+                backgroundColor: "background.paper",
               }}
             >
               <FamilyLink icon={<HomeIcon />} label="Accueil" uri="" />