When trying to "leaf through" the tutorial, I want to be able to keep clicking "next" without moving the mouse. This is not possible, because the high of the popup changes, and it is re-centered, moving the "next" button out from under the mouse. To continue, i have to move the mouse pointer to the button again.
Proposed solution: the popup should have a fixed size, it should not change and jump around when going to the next "page". If this is not feasible, the popup should not be vertically centered, but placed with the top of the popup at 20% or 30% of the height of the viewpoer.