Attaching Flybox to Body, not side of screen?

Hi.
Loving the idea of the plugin and looks great on some of my devices.
The site I am working on has a max width of 1000px (its currently not responsive – but that’s that next job).

On a screen wider that 1000px the flybox icons are stuck the either the left of right of the screen.

This can be see at https://www.stmikes.esy.es (test site)

Is there an easy way to make the icons attach to the Page/Body of the website rather than the edge of the screen?

Thanks

https://www.ads-software.com/plugins/wp-flybox/