How can I put the background video in Webflow behind everything? Why don't I get 4 cells when I create 4 columns in my quick stack in Webflow?

To put a background video behind everything in Webflow, you can follow these steps:

1. First, you need to add a new section to your Webflow page where you want the background video to appear. You can do this by dragging and dropping a Section element from the Add panel on the left-hand side of the Designer.

2. Within the newly created section, you'll need to add a Div Block that will contain your video element. Again, you can add this by dragging and dropping a Div Block element from the Add panel.

3. Now, you can add the video element itself. Select the Div Block you just created, and go to the Add panel. Under Media, you'll find the Video element. Drag and drop it into the Div Block.

4. With the Video element selected, you can upload your video file by clicking on the "Upload video" button in the Settings panel on the right-hand side.

5. Once your video is uploaded, you can customize its settings in the Settings panel. You'll likely want to set the video to loop and autoplay, but you can explore the other options as well, such as muted or play on hover.

6. To position the video behind all other elements, you'll need to adjust the z-index of the section and other overlapping elements on your page. By default, the z-index of sections in Webflow is set to 1. So, to move the video behind everything, you can increase the z-index of the section to a higher value than other elements on the page. You can find the z-index setting in the Position section of the Styles panel.

By following these steps, you should be able to add a background video in Webflow and position it behind other elements on your page.

Regarding your second question about not getting four cells when creating four columns in the quick stack, there could be a couple of reasons for this:

1. Column width: Make sure that you have set an appropriate width for each column within the quick stack. If the column width is set to 100% or a value that causes the columns to fill the entire available width, you may see all the content collapse into a single column.

2. Content length: If your content within the columns is lengthy, it might cause the columns to stack vertically instead of horizontally. In this case, you can try reducing the length or adjusting the overflow settings of the columns to ensure they fit within the available space.

3. Container width: Check the width of the container element that contains the quick stack. If the container width is smaller than the sum of the column widths, the columns might wrap to the next line. Make sure the container has enough space to accommodate all the columns.

By double-checking these aspects, you should be able to troubleshoot the issue and ensure that the quick stack creates the desired number of columns.