.gallery {
    text-align: center;
}
.gallery-item {
    width: 200px;
    height: 200px;
    max-width: 100%;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background-color: #E9E9E9;
    margin: 0.2rem;
    padding: 0.15rem;
    vertical-align: middle;
}
.gallery-item img {
    width: 100%;
    height: auto;
}
.gallery-item.vert img {
    width: auto;
    height: 100%;
}