RO Social Bookmarking image sizes

I am looking to find where or how to change the image sizes or really in this case the space around the images for this plugin. I have checked every where I know to look. It appears the actual images are 16px. But they end up being 30px because of the gray box around them. I want to basically shrink the box size around the icon so they don’t take up as much space. Can anyone give me a tutorial or a hint as to how to do this. I’d really appreciate it. Thanks

Chris