div.simple-google-photos-grid {
width:100%;
height:100%;
overflow:hidden;
}
div.simple-google-photos-grid-cell {
box-sizing:border-box;
padding:5px;
float:left;
}
img.simple-google-photos-grid-image {
object-fit: cover;
}

(function() {
if( window.jQuery ){
jQuery( document ).ready(function() {
jQuery("div.simple-google-photos-grid").each(function(i){
var container = jQuery(this);
var width = container.find("div.simple-google-photos-grid-cell").first().width();
container.find("img.simple-google-photos-grid-image").css("width", width).css("height", width);
});
});
}
})();