Video won't center

Thanks for the great plugin!!! One small issue. I can’t get videos to center on page when Responsive Video option is selected. If I uncheck it class=aligncenter works fine. (I tried .centervideo { margin: 0 auto }) Also, same problem when I switched themes. Someone else asking here: https://wordpress.org/support/topic/plugin-videojs-html5-video-player-for-wordpress-center-video but I don’t understand what the fix is.

https://wordpress.org/plugins/videojs-html5-video-player-for-wordpress/