Image Gallery shows only 1 column

Template: SimpleKey - One Page Portfolio WordPress Theme
Problem: My Image Gallery shows all images in 1 column. I would like to make it in a grid.
Website: http://www.dobozgitar.hu/#munkaim

Any help would be appreciated.

Hi, I can help you right now.

I’m a WordPress theme developer . Its my portfolio: https://themeforest.net/user/khalilthemes/portfolio

I provide customization service, if interested, contact me through my profile: https://themeforest.net/user/khalilthemes

Thanks,
Ebrahim

Thanks, I figured it out finally. Case closed.