What could be causing my background video to only appear as a line in my column after uploading it on Webflow?

Your background video appearing only as a thin line in a Webflow column is typically due to incorrect element sizing or layout configuration.

1. Check Parent Element Dimensions

• If your background video is placed inside a column, make sure the column and section have an explicit height set.
• Columns without defined height will collapse to the height of their content, which may be just a few pixels without other content.
• Set the parent section or div block to min-height: 100vh or a fixed pixel height to allow the video space to render.

2. Set Video Dimensions Directly

• Apply width: 100% and height: 100% to the background video element or the wrapping div.
• If the video is inside a flex or grid layout, confirm that the container allows it to expand in height.

3. Check Display Settings

• Ensure the section or div containing the background video is set to Display: Block or Flex, not Inline.
• Inline elements won’t allow height properties to apply properly, leading to a collapsed height.

4. Examine Object-Fit Property

• Set the background video’s object-fit to cover to make sure it scales proportionally and fills the container.
• Without object-fit: cover, the video might default to its native size or scale unpredictably.

5. Validate Column Behavior

• Columns in Webflow can behave unpredictably with media if inner elements don’t explicitly define spacing.
• Consider wrapping the video in a Div Block with defined sizing, and placing that div inside the column instead of embedding the video directly.

Summary

Your video is displaying as a line likely because of missing height definitions on the column or container. Make sure the parent elements explicitly define height and width, and set the video to fill its container using object-fit: cover and full-size settings.