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code/allapp/allapp-rn/src/app/(tabs)/_layout.tsx

@@ -86,7 +86,9 @@ export default function TabsLayout() {
           zIndex: 0,
           elevation: 24,
           shadowColor: '#000',
-          shadowOffset: { width: 0, height: 100 },
+          shadowOffset: { width: 0, height: 20 },
+          borderTopWidth: 1,
+          borderTopColor: '#f2f3f5',
         }}
       >
         <TouchableOpacity className="w-12 items-center justify-center">