How can I add a background video to my Webflow site using custom code?

To add a background video to your Webflow site using custom code, you can follow these steps:

1. Prepare your video: Convert your video file to a format supported by web browsers, such as MP4, WebM, or Ogg. Optimize the video by compressing its size and resolution to ensure faster loading times.

2. Upload the video: In your Webflow project, go to the Assets panel and upload the video file. Once uploaded, copy the URL of the video file.

3. Add a new collection: Create a new collection by going to the Collections panel and clicking the "+ New Collection" button. Give it a name and add any necessary fields. This step is necessary to add a custom code to your project.

4. Add a custom code field: In the Collection settings, go to the `Custom` tab and click on `+ Add Field`. Choose `Plain Text` as the field type and give it a name like "Background Video".

5. Apply the collection to a page: Go to the Pages panel and choose the page where you want to add the background video. In the Settings of that page, scroll down to the Collection section and select the collection you created in step 3.

6. Add custom code: In the Designer, go to the page where you want to add the background video. Drag a `Div Block` onto the canvas and make sure it covers the entire page. Then, give it a unique class name in the Class panel.

7. Custom code embed: Select the `Div Block` and click on the `+ Add Field` button in the right-side panel. Choose the `Custom Code` option. Now, paste the following code into the code field:

```html

Replace `[video URL]` with the URL you copied from the uploaded video file in step 2.

8. Set the video as a background: Switch to the Position tab in the Styles panel for the `Div Block`. Choose `Fixed` as the position type and set the `Z-index` to a high value (e.g., 9999) to ensure the video appears behind other elements.

9. Additional styling: Adjust the `Width` and `Height` of the `Div Block` to cover the entire page and ensure the aspect ratio of the video is maintained. You may also need to experiment with other CSS properties like `object-fit` to control the video's appearance.

10. Publish your site: Preview your site to see the background video in action. If everything looks good, you can publish your site and share the URL.

Note: While custom code allows you to achieve the desired functionality, be cautious when using it, as it may have compatibility issues with different browsers or future updates to Webflow. Always test your site thoroughly to ensure it works as intended.