How to create an AppBar with a bottom coloured border in Flutter?

Issue

I would like to create an App Bar like this which has a bottom border as well a tint of shadow which can be done using elevation. Could someone provide a sample code snippet to achieve this

Solution

Maybe something like this

AppBar(
   bottom: PreferredSize(
      child: Container(
         color: Colors.orange,
         height: 4.0,
      ),
      preferredSize: Size.fromHeight(4.0)),
   )

Answered By - Andrey Turkovsky