<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8" /> <meta http-equiv="X-UA-Compatible" content="IE=edge" /> <meta name="viewport" content="width=device-width, initial-scale=1.0" /> <title>Popup</title> <link rel="stylesheet" href="solution.css" /> </head> <body> <div class="backdrop"></div> <div class="popup-modal"> <h1>Look at me!</h1> <p>I'm a pop up dialog!</p> <button id="close-modal">Close Modal</button> </div> <div class="button-container"> <button id="trigger-modal">Open Modal</button> </div> <script src="solution.js"></script> </body> </html>