Update src/css/mediaelementplayer.css
Update src/css/mediaelementplayer.css

Use the normal CSS property name after the vendor prefixes.
There is an article in [CSS-Tricks](http://css-tricks.com/ordering-css3-properties/) with an explanation why this is a good idea and also Chrome audit complains about it if the vendor prefixed one is last.

libeo/Vibeo,libeo/Vibeo,libeo/Vibeo,libeo/Vibeo