?rel=0 to the YouTube URL.overflow: hidden and border: none, and ensure the container's width and height match the video.To remove thin black lines from YouTube videos in Webflow, you may need to adjust how the videos are embedded or displayed on your page.
?rel=0 to the YouTube URL to disable related videos, which sometimes adjusts how videos are displayed.
overflow: hidden and border: none to tidy up.
To remove thin black lines from YouTube videos in Webflow, ensure your video is embedded with the correct aspect ratio, check CSS for any unwanted styling and ensure the Webflow video component is used correctly for a responsive design.