How can I add a custom thumbnail over the Vimeo player in Webflow, similar to how it is done on Squarespace?

To add a custom thumbnail over the Vimeo player in Webflow, you can follow these steps:

1. First, you'll need to upload your custom thumbnail image to your Webflow project. Make sure the image is in a format supported by the web, such as JPG or PNG.

2. Next, go to the page on which you want to add the Vimeo player and custom thumbnail. Drag and drop the "Embed" element onto your page where you want the video to appear.

3. Copy the Vimeo video URL you want to embed. It should look something like this: https://vimeo.com/123456789.

4. Double click on the newly added "Embed" element in Webflow. In the settings panel on the right-hand side, you'll see a field labeled "Embed Code." Paste the Vimeo video URL inside this field.

5. Now, to add the custom thumbnail on top of the Vimeo player, you'll need to use some custom CSS. Click on the "Settings" tab in the right-hand panel of the "Embed" element.

6. Scroll down to the "Custom Attributes" section and click the "+" button to add a new attribute. Set the attribute name as "style" and the value as the CSS code to position the thumbnail image.

For example, you can use the following CSS code:
```css
position: relative;
z-index: 1;
background-image: url('https://your-custom-thumbnail-image-url.jpg');
background-size: cover;
background-position: center;
```

Replace the `https://your-custom-thumbnail-image-url.jpg` with the URL of your uploaded custom thumbnail image.

7. Save the changes and preview your page. You should now see the Vimeo player with the custom thumbnail overlaid on top of it.

By following these steps, you can add a custom thumbnail over the Vimeo player in Webflow, similar to how it is done on Squarespace. Remember, you can adjust the CSS properties to position, size, and style the thumbnail image as desired.