1. Basic Alert

import 'package:flutter/material.dart';

Container(
  padding: const EdgeInsets.symmetric(horizontal: 16, vertical: 20),
  decoration: BoxDecoration(
    color: Colors.orange.shade50,
    borderRadius: BorderRadius.circular(16),
  ),
  alignment: Alignment.centerLeft,
  child: const Text(
    'Change a few things up and try submitting again!',
    style: TextStyle(
      fontWeight: FontWeight.w600,
      fontSize: 14,
      color: Colors.orange,
    ),
  ),
),