#foogallery-gallery-15936.masonry-layout-fixed .item { margin-bottom: 10px; width: 500px; } #foogallery-gallery-15936.masonry-layout-fixed .masonry-item-width { width: 500px; } #foogallery-gallery-15936.masonry-layout-fixed .masonry-gutter-width { width: 10px; }