Our detectives are back with the following intel on this WordPress site
The site is using the unibz theme by Giulio Roman, Anna Ricci .
We could identify 4 plugins (there might be more) - Accordion , Photo Gallery by 10Web – Mobile-Friendly Image Gallery , Social Icons Widget and Yoast SEO
This theme was developed to have Wordpress instances in harmony with the style of unibz's main webpages.
Photo Gallery is a powerful image gallery plugin with a list of advanced options for creating responsive image galleries with beautiful lightbox.