Social Proof Notification - Copy this React, Tailwind Component to your project

Create a responsive social proof notification showing '10 people viewed this ad in the last hour'. For mobile devices (width < 768px), make it slide down from the top center of the screen. For desktop screens, make it slide in from the right side. Include a user icon, subtle shadow, and smooth entrance/exit animations. The notification should automatically disappear after 5 seconds. Style it with modern design principles and ensure smooth transitions between mobile and desktop layouts.