如何设置这种文本字段的样式

@override
  Widget build(BuildContext context) {
    return Scaffold(
        appBar: AppBar(
          title: Text("Sample"),
        ),
        body: Padding(
          padding: EdgeInsets.all(10),
          child: Container(
            decoration: BoxDecoration(
                border: Border.all(
                  color: Colors.grey[500],
                ),
                borderRadius: BorderRadius.all(Radius.circular(8))),
            width: double.infinity,
            height: 50,
            child: Row(
              children: <Widget>[
                Container(
                    padding: EdgeInsets.all(10),
                    color: Colors.grey.shade300,
                    height: 50,
                    child: Align(
                      alignment: Alignment.center,
                      child: Text(
                        "RS \u20B9",
                        style: TextStyle(
                            fontSize: 24, fontWeight: FontWeight.bold),
                      ),
                    )),
                SizedBox(
                  width: 10,
                ),
                Expanded(
                    child: Container(
                        height: 50,
                        child: TextField(
                          decoration: InputDecoration(
                              border: InputBorder.none,
                              hintText: "Enter Bid",
                              labelStyle: TextStyle(fontSize: 24)),
                        )))
              ],
            ),
          ),
        ));
  }

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