.gallery-single { margin-bottom: 30px; }
.izotope-container { position: relative;}
.item-single { float: left; position: relative; }
.item-single img { display: block; width: 100%; height: auto; }

/* gutter/base */
.whizz-gallery .item-single { margin: 7.5px; }
.whizz-gallery .grid-sizer { margin: 7.5px; }

/* colonne predefinite */
.whizz-gallery.cols-1 .grid-sizer,
.whizz-gallery.cols-1 .item-single { width: calc(100% - 15px); }

.whizz-gallery.cols-2 .grid-sizer,
.whizz-gallery.cols-2 .item-single { width: calc(50% - 15px); }

.whizz-gallery.cols-3 .grid-sizer,
.whizz-gallery.cols-3 .item-single { width: calc(33.333% - 15px); }

.whizz-gallery.cols-4 .grid-sizer,
.whizz-gallery.cols-4 .item-single { width: calc(25% - 15px); }

.whizz-gallery.cols-5 .grid-sizer,
.whizz-gallery.cols-5 .item-single { width: calc(20% - 15px); }

.whizz-gallery.cols-6 .grid-sizer,
.whizz-gallery.cols-6 .item-single { width: calc(16.666% - 15px); }

/* Responsive */
@media screen and (max-width: 991px) {
  .whizz-gallery.cols-4 .grid-sizer, .whizz-gallery.cols-4 .item-single,
  .whizz-gallery.cols-5 .grid-sizer, .whizz-gallery.cols-5 .item-single,
  .whizz-gallery.cols-6 .grid-sizer, .whizz-gallery.cols-6 .item-single { width: calc(33.333% - 15px); }
  .whizz-gallery.cols-3 .grid-sizer, .whizz-gallery.cols-3 .item-single { width: calc(50% - 15px); }
}
@media screen and (max-width: 575px) {
  .whizz-gallery .grid-sizer, .whizz-gallery .item-single { width: 100%; margin: 0 0 12px 0; }
}