flutter stack

return Scaffold(
      backgroundColor: Colors.amber,
      body: Stack(
        children: [
          Positioned(
            left: 0,
            child: Image.asset("assets/images/wave-1.png"),
          ),
          Positioned(
            right: 0,
            child: Image.asset("assets/images/wave-2.png"),
          ),
          Positioned(
            left: 0,
            bottom: 0,
            child: Image.asset("assets/images/wave-3.png"),
          ),
          Positioned(
            right: 0,
            bottom: 0,
            child: Image.asset("assets/images/wave-4.png"),
          ),
          Column(
            children: [
              const SizedBox(height: 57),
              const Text("Register",
                  style: TextStyle(fontFamily: "Aleo", fontSize: 24)),
              const SizedBox(height: 57),
              Form(
                child: Column(
                  children: const [
                    CustomInput(hint: 'Masukan Nama'),
                    CustomInput(hint: 'Masukan Alamat'),
                    CustomInput(hint: 'Masukan Email'),
                    CustomInput(hint: 'Masukan Password'),
                    SizedBox(height: 48),
                    CustomButton(text: "Register"),
                    SizedBox(height: 25),
                  ],
                ),
              ),
              HaveAnAccountText(
                  text1: "Belum punya akun ? ",
                  text2: "Daftar Sekarang",
                  route: RegisterPage.routeName),
            ],
          ),
        ],
      ),
    );