How can I make a background video fullscreen on Webflow, specifically on screens with a resolution of 1920px and above, while still maintaining full screen on all other resolutions? The video I have is 1920x1080 and I don't mind if it appears pixelated on larger resolutions as long as it fills the screen. Why is it so difficult to achieve this? I work with game engines but I'm still struggling with this tool.

You're trying to make a background video truly fullscreen on all screen sizes, especially on 1920px and wider displays, but Webflow’s default behavior can limit the full coverage depending on how you’ve structured the layout.

Here's how to force your background video to fully cover the screen at all resolutions, even if it means some cropping or slight pixelation.

1. Use a Section with 100vh Height

• Add a Section to your page or make sure an existing one is being used as the container for your background video.
• Set its height to 100vh to ensure it takes up the full vertical space of the viewport.

2. Add the Background Video Element

• Inside the section, drag a Background Video element from the Add panel.
• Upload your 1920x1080 video file.

3. Set the Video to Absolutely Position and Cover

• Select the Background Video element.
• Go to the Position settings and set:
• Position: Absolute
• Top: 0
• Left: 0
• Set Width: 100% and Height: 100%.
• In the Object Fit setting, choose Cover to ensure it always fills the container, even if it has to crop or stretch slightly.

4. Set the Section’s Position to Relative

• Select the parent Section that contains the video.
• Set Position: Relative (so the child Absolute-positioned video anchors properly).
• Optional: Add z-index: 0 if layering elements on top.

5. Ensure Overflow Is Visible

• If elements are being clipped, make sure Overflow: Visible is set on the Section and Body (if needed).
• However, in most cases, this isn’t required unless you have animations or other positioned elements.

6. Add Fallback Styles for Smaller Devices (Optional)

• Use Webflow’s breakpoints to check performance on mobile/tablet.
• Background Video elements don’t play on mobile for battery limits, so Webflow replaces it with the poster image automatically.
• You can style a fallback background image manually under mobile breakpoints if you want more control.

7. Why This Feels More Complicated in Webflow

• Compared to game engines, Webflow operates on CSS layout rules, not pixel-placed rendering.
• 100% width or vh units require explicit overrides to force full coverage and layering.
• Webflow’s Background Video widget doesn’t auto-stretch beyond the intrinsic video resolution, so you have to manually apply the CSS behaviors you’re used to in game engines.

Summary

To make your 1920x1080 video fullscreen in Webflow across all resolutions, use a 100vh Section with Relative positioning, place the Background Video inside, set it to Absolute, and apply 100% width/height with Object Fit: Cover. This forces the video to always fill the screen regardless of resolution—even beyond 1920px—though it may crop slightly to maintain aspect ratio.