Image view with translucent background

I would like to set the gallery view as on the page http://themes.muffingroup.com/be/bw/  So that the background is translucent, if I click on a picture. Which attitude do I have to activate in my gallery? 

I have currently set it as a portfolio ( Item column) as follows:

[gallery size="full" link="file" ids="2891,2982,2899,2739,2737,2741,2746,2745,2900,2738,2743,2744,2740,2780,2892,2692,2742,2779,2778,2901,2777,2983,2776,2782,2902,2781,2775,2903,2774,2694" style="masonry"]

my site:

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