Make container widget fill parent vertically

Question

TL;DR Need the container to fill the vertical space so that it can act as a ontap listener. Have tried most solutions but nothing seems to work.

So what I am trying

Answer 1

As of Jan 2020 the simplest is to use an Expanded Widget

Expanded(flex: 1,
         child: Container(..),
            ),

https://api.flutter.dev/flutter/widgets/Expanded-class.html