How To Remove Underline From Inputfield Using Flutter App

import 'package:flutter/material.dart';
void main() {
  runApp(new MyApp());
}
class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return new MaterialApp(
      debugShowCheckedModeBanner: false,
      title: 'Transform',
      home: new MyHomePage(),
    );
  }
}
class MyHomePage extends StatefulWidget {
  @override
  _MyHomePageState createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
  TextEditingController _textFieldController = TextEditingController();
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      backgroundColor: Colors.black,
      appBar: AppBar(
        backgroundColor: Colors.orange,
        title: Text('Remove Underline From InputField'),
      ),
      body: Center(
        child: Padding(
          //Add padding around textfield
          padding: EdgeInsets.symmetric(horizontal: 20.0),
          child: Container(
            decoration: BoxDecoration(
              color: Colors.white,
              borderRadius:  BorderRadius.circular(32),
            ),
            child: TextField(
              decoration: InputDecoration(
                hintStyle: TextStyle(fontSize: 15,color: Colors.black45),
                hintText: 'Search your trips',
                suffixIcon: Icon(Icons.search,size: 18,),
                border: InputBorder.none,
                contentPadding: EdgeInsets.all(15),
              ),
            ),
          ),
        ),
      ),
    );
  }
}