Image Opening in Wrong Position if Scrolling

[RonivanFontanez]

So I have an issue with ShadowBox, if I scroll down and try to open an image, it will always open at the very botton of the page, not the center. Only if I not scroll down that the opens in the correct position. I tried tho change some lines in the CSS but it was to no avail. Someone could help me a bit on this?

Also this don't happen in any mobile device, so I guess this is only to computer browser. Also I tested in differente browsers like Firefox and Chrome, giving me the same result.

[CameronSchuyler]

Link?

[rosscg]

I had the same problem in Chrome v108.0.5359.124 and Safari v14.0.2

It appears to be due to setContainerPosition not checking whether absolute positioning is used. I've updated the positioning in this PR but I haven't tested it on browsers which use absolute positioning.