Are there any examples of simple responsive popup/modal windows with a close button that I can use on my Webflow site?

2. Set the display property of the popup/modal container to "none" initially, so it's hidden from view. You can do this by adding a custom style to the HTML embed element or by giving it a class and styling it through the Webflow Designer.

3. Add a button or an element to trigger the opening of the popup/modal window. For example, you can use a button element or an image with an "onclick" event. Set the event to a custom code that will handle the opening of the popup/modal container. Here's an example of JavaScript code to achieve this:

```
document.getElementById('popup-toggle').addEventListener('click', function() {
document.getElementById('popup-container').style.display = 'block';
});
```

In this code, replace `'popup-toggle'` with the ID of your trigger element/button, and `'popup-container'` with the ID of your popup/modal container.

4. Now, you need to add a close button to your popup/modal window. Inside the container, add a button or an icon that will act as the close button. Set an event listener for the close button that will toggle the display of the popup/modal container back to "none". Here's an example JavaScript code snippet for that:

```
document.getElementById('popup-close').addEventListener('click', function() {
document.getElementById('popup-container').style.display = 'none';
});
```

Just like before, replace `'popup-close'` with the ID or class of your close button and `'popup-container'` with the ID or class of your popup/modal container.

5. Style your popup/modal window to make it responsive and visually appealing. You can use CSS to control the size, position, colors, and other properties.

Remember to consider accessibility best practices by adding appropriate aria attributes, keyboard interactions, and focus management to ensure that users can navigate and utilize the popup/modal window easily.

By following these steps and customizing the code and styling according to your needs, you should be able to create a simple responsive popup/modal window with a close button for your Webflow site.