THUMBNAILS: ALING CENTER (css not working)

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Sorry for the delay @strummer84 , we’re a bit behind lately with all the holiday activity.

I’ve looked at your example page but I don’t see any NextGEN galleries being displayed there.

Dear Benjamin, of course there are.
In that page there are few galleries. Don’t you see them? Scroll down, please. There are a few.

Example: screenshot. https://snipboard.io/xBLPpn.jpg

Those galleries appear to be from the WordPress Media Library, not NextGEN Gallery.

The following CSS should fix your problem though:

.gallery-item {
    text-align: center;
}

I hope that helps!

It worked! Thank you very much!