debug banner flutter

// Add debugShowCheckedModeBanner: false to your Material
return new MaterialApp(
	debugShowCheckedModeBanner: false,
    theme: new ThemeData(
      primarySwatch: Colors.green,
    ),
    //...
);

MaterialApp(
  debugShowCheckedModeBanner: false,
)

MaterialApp(
 debugShowCheckedModeBanner: false
)

add debugShowCheckModeBanner:false in MaterialApp()