se cambio el background de las paginas de oniel a un azulito

fast_med_flutter/lib/routes/home.dart

   @override
   Widget build(BuildContext context){
     return Scaffold(
+      backgroundColor: Colors.blue[50],
       appBar: AppBar(
         backgroundColor: Colors.red[300],
         title: Text('Bienvenido'),

fast_med_flutter/lib/routes/ver_oficina.dart

     var especialistas = getEspecialistas(especialista);
 
     return Scaffold(
+      backgroundColor: Colors.blue[50],
       appBar: AppBar(
         title: Text(name),
         backgroundColor: Colors.red[300],

fast_med_flutter/lib/routes/ver_oficinas.dart

     });
     List<Oficina> lista =  _oficinas;
     return Scaffold(
+      backgroundColor: Colors.blue[50],
       key: _scaffoldKey,
       appBar: AppBar(
         title: Text('Oficinas'),