.masonry-gallery {
    margin-left: -4px;
}
.masonry-gallery div {
    overflow: hidden;
    margin: 0 0 8px 8px;
    border: 2px solid #000;
    box-shadow: 2px 2px 6px rgba(0, 0, 0, 0.75);
}
.masonry-gallery img {
    vertical-align: top;
}
@media screen and (min-width: 450px) {
    .masonry-gallery {
        display: -ms-flexbox;
        display: flex;
        width: 100%;
        -ms-flex-flow: row wrap;
        flex-flow: row wrap;
    }
    .masonry-gallery div {
        height: 150px;
        -ms-flex: 0 0 50%;
        flex: 0 0 50%;
        max-width: calc(50% - 8px);
    }
    
    .masonry-gallery img {
        object-fit: cover;
        width: 100%;
        height: 100%;
    }
}

@media screen and (min-width: 768px) {
    .masonry-gallery div {
        height: 250px;
        -ms-flex: 0 0 33.3333333%;
        flex: 0 0 33.3333333%;
        max-width: calc(33.3333333% - 8px);
    }
}

@media screen and (min-width: 992px) {
    .masonry-gallery div {
        -ms-flex: 0 0 25%;
        flex: 0 0 25%;
        max-width: calc(25% - 8px);
    }
}

@media screen and (min-width: 1200px) {
    .masonry-gallery div {
        -ms-flex: 0 0 16.6666667%;
        flex: 0 0 16.6666667%;
        max-width: calc(16.6666667% - 8px);
    }
}