div.eventgallery-tiles-list .eventgallery-tile {
    width: 33,33333%;
}
@media (max-width: 1500px) {
	div.eventgallery-tiles-list .eventgallery-tile {
		width: 50%;
       	}
}

@media (max-width: 800px) {
	div.eventgallery-tiles-list .eventgallery-tile {
		width: 100%;
        	}
}