Basic Banner

import 'package:flutter/material.dart';

MaterialBanner(
  backgroundColor: Theme.of(context).colorScheme.primary.withOpacity(0.1),
  leading: Icon(
    Icons.sell,
    size: 20,
    color: Theme.of(context).colorScheme.primary,
  ),
  content: const Text(
    'Flash Sale 200k only today',
    style: TextStyle(
      fontWeight: FontWeight.w400,
      fontSize: 14,
      color: Colors.black87,
    ),
  ),
  actions: [
    CloseButton(
      onPressed: () {},
      color: Colors.black54,
    ),
  ],
),