Flutter Column Layout Snippet Example

void main() {
  runApp(PostSrc());
}

class PostSrc extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          title: const Text("PostSrc"),
          backgroundColor: Colors.green.shade300,
        ),
        backgroundColor: Colors.green.shade100,
        body: SafeArea(
          child: Center(
            child: Column(
              mainAxisAlignment: MainAxisAlignment.center,
              children: [
                Container(
                  width: 100,
                  height: 100,
                  padding: const EdgeInsets.all(10),
                  margin: const EdgeInsets.all(10),
                  decoration: BoxDecoration(
                    borderRadius: BorderRadius.circular(12),
                    color: Colors.white,
                  ),
                  child: const Center(
                    child: Text(
                      "1",
                      style: TextStyle(
                        color: Colors.green,
                        fontFamily: "Pacifico",
                        fontSize: 32,
                      ),
                    ),
                  ),
                ),
                Container(
                  width: 100,
                  height: 100,
                  padding: const EdgeInsets.all(10),
                  margin: const EdgeInsets.all(10),
                  decoration: BoxDecoration(
                    borderRadius: BorderRadius.circular(12),
                    color: Colors.white,
                  ),
                  child: const Center(
                    child: Text(
                      "2",
                      style: TextStyle(
                        color: Colors.green,
                        fontFamily: "Pacifico",
                        fontSize: 32,
                      ),
                    ),
                  ),
                ),
                Container(
                  width: 100,
                  height: 100,
                  padding: const EdgeInsets.all(10),
                  margin: const EdgeInsets.all(10),
                  decoration: BoxDecoration(
                    borderRadius: BorderRadius.circular(12),
                    color: Colors.white,
                  ),
                  child: const Center(
                    child: Text(
                      "3",
                      style: TextStyle(
                        color: Colors.green,
                        fontFamily: "Pacifico",
                        fontSize: 32,
                      ),
                    ),
                  ),
                ),
              ],
            ),
          ),
        ),
      ),
    );
  }
}

Flutter Column Layout Snippet Preview