Here, the screen forces the ConstrainedBox to be exactly
the same size as the screen, so it tells its child Container
to also assume the size of the screen, thus ignoring its
constraints parameter.

Example 10

Now, Center allows ConstrainedBox to be any size up to
the screen size. The ConstrainedBox imposes additional
constraints from its constraints parameter onto its child.

The Container must be between 70 and 150 pixels.
It wants to have 10 pixels,
so it ends up having 70 (the minimum).

Example 11

Center allows ConstrainedBox to be any size up to the
screen size. The ConstrainedBox imposes additional
constraints from its constraints parameter onto its child.

The Container must be between 70 and 150 pixels.
It wants to have 1000 pixels,
so it ends up having 150 (the maximum).

Example 12