This is the code I use. Remove the * where appropriate. You'll have to adjust the widths if you want it to be a different size. They're set just enough to show the controls right now. Don't put other things inside the codes, only after the /css-div because what that is is a css box that hides anything that tries to extend outside of it, creating the illusion of a smaller music player.
...So yeah, put anything else in there and it will be invisible.