[Plugin: Gallery to Slideshow] Vertically center the image

I’d like to vertically align the slide within the wrapper, and I know this is most likely a CSS fix and not any trouble with gallery-to-slideshow, but I am stumped.

I added “display: table-cell; vertical-align:middle” to my css for “gallery-to-slideshow .slides”. It works to align the images vertically, but also causes a nasty shift/jump on loading the images. I saw people had referred to this jump in other support posts, and the suggestion was to make sure that “margin: 0 auto; padding: 0;” was still there – but I have retained that.

https://www.ads-software.com/extend/plugins/gallery-to-slideshow/