deprecated code exists

[keilvher1]

Column(
children: [
Image.asset('assets/diamond.png'),
const SizedBox(height: 16.0),
Text(
'SHRINE',
style: Theme.of(context).textTheme.headline5,
),
],
)

headline5 has deprecated. So change it to headlineSmall

[keilvher1]

caption: base.caption!.copyWith(
fontWeight: FontWeight.w400,
fontSize: 14.0,
),
caption is also deprecated. change it to bodySmall

[keilvher1]

bodyText1: base.bodyText1!.copyWith(
fontWeight: FontWeight.w500,
fontSize: 16.0,
),
bodyText1 to bodyLarge. code will be with you.

[Amunoz-1]

Step 5 - Towards the end:

Finally, let's have the Cancel button use the secondary color rather than the primary for increased contrast.

TextButton(
  child: const Text('CANCEL'),
  onPressed: () {
    _usernameController.clear();
    _passwordController.clear();
  },
  style: TextButton.styleFrom(
    primary: Theme.of(context).colorScheme.secondary,
  ),
),

had to change 'primary' to 'foregroundColor'