You’ll need to provide a link. Looking at the CSS rule without being able to see the markup isn’t much help.
Sorry!
Here’s the link to my page
Try this:
.entry-content object {
margin: 0 auto;
}
That moved the player over, but it’s still not quite in the center.
I can assure you that it is dead centre.
If, on the other hand, you are concerned that the white space makes the player appear misaligned at a fleeting glance, then that is a separate question. The plugin that you are using to embed the player sets the object width at 290px, in order to accommodate the full player when a user initiates audio playback. Hence, when the audio is not being played, there is a blank space.
If the plugin doesn’t have fluid resizing, then either accept it as is, add a subtle border to make clear that it’s not misaligned, or look for a different plugin.
Thanks for the help and the explanation!