<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8" /> <meta name="viewport" content="width=device-width, initial-scale=1.0" /> <link rel="stylesheet" href="style.css" /> <title>Toast Notification</title> </head> <body> <div id="toasts"></div> <button class="btn" id="button">Show Notification</button> <script src="script.js"></script> </body> </html>