Apparently I need to start smaller when it comes to posting video to this post. I tried to save the HTML, but it wouldn't allow me to centre the video. After several tries at rewriting the code, admittedly my coding is not beyond beginner, I gave up and inserted the video as I had done with the other videos in earlier posts: go to the movie icon in the list across the top of this composition window, click on the icon, follow the instructions. Volia, a centred video. It is narrow enough too. My first attempt gave me a video that was wider than my post column. But that I solved with the coding.