Keyboard hides login fields and button

[JacoFourie]

Describe the bug
When a user taps on the username or password fields the keyboard will pop up and hide the dialog.

To Reproduce
I do not use the login page as the first page in the app. I use it when a user taps on a login icon.
Then I use the Scaffold widget to create a page and I add the Login Widget.

Expected behavior
The text and buttons should be visible

Additional context
I am not sure if I should be using an scaffold to build the page. I need an Appbar and a way to get back to the normal app if the user decides to cancel the login.