difference between actual code and codelab code

[minchanpark]

// TODO: Add TextField widgets (101) // [Name] TextField( decoration: const InputDecoration( filled: true, labelText: 'Username', ), ), // spacer const SizedBox(height: 120.0), // [Password] TextField( decoration: const InputDecoration( filled: true, labelText: 'Password', ), obscureText: true, ),

it is different between actual code and codelab code. "const SizedBox(height: 120.0),"-->"const SizedBox(height: 12.0),"