[Plugin: MediaElement.js – HTML5 Video & Audio Player] Centre the player in the middle of the pa

I have an mp3 and it plays fine but I want to make it CENTRED, not all the way to the left as it is by default. How do I do this?

I tried to write the code, then highlught it and select the ‘align centre’ in the visual page editor, but it does not work.

Thank you!

http://wordpress.org/extend/plugins/media-element-html5-video-and-audio-player/