Container(
  height: 500,
  child: Card(
    child: Image.network(
      'https://placeimg.com/640/480/any', fit: BoxFit.fill,),
    shape: RoundedRectangleBorder(
      borderRadius: BorderRadius.circular(10.0),
    ),
    elevation: 5,
    margin: EdgeInsets.all(10),
  ),
),