Dropdown Button Form Field

1

import 'package:flutter/material.dart';

DropdownButtonFormField(
  value: 'Beginner',
  items: ['Beginner', 'Intermediet', 'Expert'].map((e) {
    return DropdownMenuItem(
      value: e,
      child: Text(e),
    );
  }).toList(),
  onChanged: (value) {},
),

2

import 'package:flutter/material.dart';
import 'package:gap/gap.dart';

DropdownButtonFormField(
  value: 'Beginner',
  items: ['Beginner', 'Intermediet', 'Expert'].map((e) {
    return DropdownMenuItem(
      value: e,
      child: Text(e),
    );
  }).toList(),
  onChanged: (value) {},
  borderRadius: BorderRadius.circular(8),
  icon: const Icon(Icons.keyboard_arrow_down),
  decoration: InputDecoration(
    border: OutlineInputBorder(
      borderRadius: BorderRadius.circular(12),
      borderSide: const BorderSide(color: Colors.grey),
    ),
    focusedBorder: OutlineInputBorder(
      borderRadius: BorderRadius.circular(12),
      borderSide: BorderSide(
        color: Theme.of(context).primaryColor,
        width: 2,
      ),
    ),
  ),
),