Node Gallery add media button is not properly styled

Hello,

When enabling the Node Gallery module and using the "Media file selector" widget to upload files, the "add" button is not styled as a button. It just looks like a regular link, and I'm sure some people may overlook the add button because of this.

I have attached a screenshot with the button highlighted with firebug. It really should look like the "save" and "preview" buttons.

Thank you for your time.

Best regards,
Ao