WordPress fix Alligne gallery in the center

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Alligne gallery in the center, by minimaryds

Hello,

I created a gallery with Jetpack and Responsive Lightbox. The gallery that I created is mosaic type. The problem is that is always alligned at the left of the page, so then I always have an empty space at the right. I would like to put the gallery in the center, but I do not how to do it. I already put in the page attributes that I want the template Full Width because I thought that maybe that could be the problem, but nothing changed. The theme that I use to create my website is Nikkon.

Thank you so much.

Alligne gallery in the center