Centering problem when page has a scrollbar

[cadday]

Hi,

I have noticed a problem with positioning when the page has a scrollbar. You may recreate the problem at the demo page(https://frontend-collective.github.io/react-image-lightbox/) by making it small enough to show a scrollbar(eg: 1000x500px)

I don't know if it is about the modal plugin or this one but I would appreciate if anyone got a solution.

Here is a screenshot, you may notice the problem on the left side spacing.