Floating Whats App Button - Copy this Html, Tailwind Component to your project

Create a floating WhatsApp button that appears at the bottom right of the screen. The button should have the WhatsApp icon and vibrate like it’s receiving a call. The button should be styled with a green background, rounded edges, and a subtle shadow. When hovered, the background color should darken slightly. The button should be linked to a WhatsApp contact (replace with a sample phone number). The button should animate with a "vibrating" effect as if it’s receiving a call. Use Tailwind CSS for styling and include the animation in pure CSS.