Centering Elements?

I have the plugin installed and working properly but I have a question about centering?

Here is a Screen Shot of a gallery in place on a site I am working on. As you can see from the fine border lines around the live area of the page that the thumbnails are left justified.

Is there any way to center the thumbnails?

Also I turned off the image click function but when you scroll down the page with a mouse wheel scrolling is stopped if the cursor gets over the gallery. Can that be turned off?

Thanks

https://wordpress.org/plugins/bmo-expo/