Masonry gallery is not responsive at all on resolution for tablet, please see this screenshot - http://prntscr.com/szevbh

It's very important for me to fix this issue in theme, what's solution for that ?

Thank you, I already fixed with adding gap between gallery items 11px instead of 10px, and that works ok, but if an issue occurs again in the future, I will of course use the following code. 

Thank you one more time