Can I center the "button text" on a modal popup?

Here's my page: http://austinreptileservice.net/joomla/index.php/en-us/reptile-id/snake-id-guides/non-venomous-snake-id-guide. View this at 768x1024 (iPad).

See "Bullsnake", the modal is the grey area below the name of the snake. I'd like this button text to be centered.

What's weird is if the modal's button text is long enough, it will center. But if it's short, it is aligned to the left.
The snake right below "bullsnake", it's modal's button text is centered!

Thanks for your help!
Lisa W.

Bump....

Hello, I haven't received a fix for this issue yet.
Lisa W.