I've been embedding several videos in my blog "Falling In Love with Bollywood" when I encountered a problem.
I couldn't center the videos - align="center" attribute was either deprecated or just wouldn't work within the <div> <p> or <iframe> tags.
After searching extensively, I found the answer by wrapping the <iframe> in a <div> CSS style tag:
<div style="text-align: center;">
Here is a YouTube video which uses this code to center it in the column:
Enjoy employing this very simple solution next time you embed a youtube file or other iframe content!