Create a nosto.com popup based on design sketch

Use CSS and HTML to create a popup based on my design sketch. The popup has a button that shows a coupon code when clicked. Look at this example: [login to view URL]ø[login to view URL] (open in incognito/private window). When the button is clicked the code appears above the button and the text on the button changes to "copy the code" (another click on the button will then copy the code to the clipboard). You should be familiar with [login to view URL] where the code will be implemented.