5. Alert With Close

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

Container(
  padding: const EdgeInsets.fromLTRB(16, 20, 10, 20),
  decoration: BoxDecoration(
    color: Colors.red.shade50,
    borderRadius: BorderRadius.circular(16),
  ),
  alignment: Alignment.centerLeft,
  child: Row(
    children: [
      const Icon(
        Icons.info_outline_rounded,
        color: Colors.red,
      ),
      const Gap(12),
      const Expanded(
        child: Text(
          'Change a few things up and try submitting!',
          style: TextStyle(
            fontWeight: FontWeight.w600,
            fontSize: 14,
            color: Colors.red,
          ),
        ),
      ),
      const Gap(12),
      CloseButton(
        onPressed: () {},
        color: Colors.red,
      ),
    ],
  ),
),