I am trying to put vimeo videos in the background (to autoplay) in multiple sections on a home page for a client. I've seen it done well at Farmuse.com... however, the videos will sometimes have a black margin on the left and right sides, and sometimes not. I have made sure they are all set to full width, and even played with the grid settings, but I cannot get all of them to stretch full width; they glitch in and out of having a black margin on the left and right sides. Any ideas why this is happening?