Fill all available horizontal space in a stack

Question

Inside a card I have a stack with 1) an image and 2) a text inside a container. How can I make the container width to fill the card width?

Card(
  clipBehavior: Clip.antiAlias,
  child: Stack(
    children: <Widget>[
      Positioned.fill(child: Image.network(
          image_url,
          fit: BoxFit.fitWidth,
        ),
      ),
      Positioned(
        bottom: 0,
        child: Container(
          padding: new EdgeInsets.fromLTRB(10.0, 5.0, 10.0, 5.0),
          decoration: new BoxDecoration(color: Colors.black12),
          child: Row(
            children: <Widget>[
              Text("test1"),
              Text("test2"),
              Text("test3"),
            ],
          ),
        ),
      ),
    ],
  )
);

Answer 1

Set the left and right values to 0 so that the container will behave so.

Card(
  clipBehavior: Clip.antiAlias,
  child: Stack(
    children: <Widget>[
      Positioned.fill(child: Image.network(
          image_url,
          fit: BoxFit.fitWidth,
        ),
      ),
      Positioned(
        bottom: 0,
        left: 0,
        right: 0,
        child: Container(
          padding: new EdgeInsets.fromLTRB(10.0, 5.0, 10.0, 5.0),
          decoration: new BoxDecoration(color: Colors.black12),
          child: Row(
            children: <Widget>[
              Text("test1"),
              Text("test2"),
              Text("test3"),
            ],
          ),
        ),
      ),
    ],
  )
);