Audio player width problem

Hi, I have a problem with the width of the audio player controls extending beyond the container div. This occurs whenever I have a content area which occupys only a third of the page width or less. I did not have this problem with WordPress themes which use the default audioplayer styles.

Here is an example of the page (may display correctly on big monitors though!):

My question: Is there a simple way to return all the audioplayer css values to their default WordPress settings? I have come across solutions on this forum but they all involve re-coding specific elements of the mediaplayer. I would prefer a simpler solution if possible!