Unwanted thin dark line on background video ONLY ON FIREFOX

Hi! :wave:

On my loading bar animation video in the hero section, there is/are a dark line/s at the top and/or the bottom of the video on Firefox (not on Safari and Chrome). - What’s the reason? How can I fix it? You may check it out desktop (mobile is not yet optimised).

Thank you so much! :pray:


Check it out here: https://www.samuelsiebler.com/

Here is my site Read-Only: Webflow - SAM Portfolio 2022