https://pub.dev/packages/blockquote

blockquote-options.dart

BlockQuote(
  outerPadding: const EdgeInsets.all(20),
  blockColor: Colors.blueAccent,
  blockWidth: 5,
  child: Column(
    crossAxisAlignment: CrossAxisAlignment.stretch,
    children: [
      Text(
        'Lorem ipsum dolor sit amet, is the best place to hide a text.',
        textAlign: TextAlign.justify,
      ),
      Text(
        '~ Change my mind!',
        textAlign: TextAlign.end,
      )
    ],
  ),
),