.blck-gallery_masonry {
    display: grid;
    grid-template-columns: repeat(5,1fr);
    grid-gap: 20px;
    margin: 0 -10px;
}
  .blck-gallery_masonry .item {padding: 10px;}
  .blck-gallery_masonry .item img {}
  .blck-gallery_masonry .item .caption {
    margin: 10px 0 0 0;
    text-align: center;
    font-size: 11px;
    opacity: 0.5;
    line-height: 1.4;
    padding: 0 20px;
}

.blck-gallery_masonry[data-columns="6"] .item {width: 16.66%;}
.blck-gallery_masonry[data-columns="5"] .item {width: 20%;}
.blck-gallery_masonry[data-columns="4"] .item {width: 25%;}
.blck-gallery_masonry[data-columns="3"] .item {width: 33.33%;}
.blck-gallery_masonry[data-columns="2"] .item {width: 50%;}