Sorry if this has been covered already. I've done my best but cannot manage to find my answer. But I'm still very new at this.
1. How can I make an iframe or picture open in the center of the page, regardless how far down you scroll?
2. How can I set the overlay to cover the entire page, again regardless how far down you scroll?
If you click on the lowest thumbnail on this page, the problem is clear:
thank you for your help and great plugin!