.image-gallery ul {
    list-style: none;
    margin: 0;
    padding: 0;
    display: grid;
    grid-template-columns: masonry;
    grid-template-rows: repeat(1fr, 1fr);
}

.image-gallery ul li {
    margin: 0;
    margin-bottom: 30px;
    /* border: 1px solid red; */
    display: inline-block;

    max-width: 500px;
    max-height: 300px;
    min-height: 100px;
    min-width: 300px;
}


/* image */
.image-gallery ul li  img {
    width: 100%;
}