In Flutter, how can I create a shape like this XML shape I created in android java app

I created an android app in java and I had this xml shape in it:

<?xml version="1.0" encoding="UTF-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android" android:shape="rectangle">
<corners android:radius="20dp"/>
<padding android:left="10dp" android:right="10dp" android:top="10dp" android:bottom="10dp"/>
<stroke android:width="1dp" android:color="@color/DodgerBlue"/>
<solid android:color="@color/White" />

Now I am creating a flutter app, so I am trying to create the same shape in flutter, but I had no luck.

Can someone guide me on how to do this ?

Thanks.

The simplest way to add border radius and border width is a container using BoxDecoration

import 'package:flutter/material.dart';

void main() {
  runApp(const App());
}

class App extends StatelessWidget {
  const App();
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
          body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: [
            _simpleBorder(),
          ],
        ),
      )),
    );
  }

  Widget _simpleBorder() => Container(
        width: 200,
        height: 50,
        decoration: BoxDecoration(
            borderRadius: BorderRadius.circular(20),
            border: Border.all(color: Colors.blue)),
      );
}

There are more advanced ways using shapes in Flutter. If this does not solve your question I can provide more info on shapes