.gallery {
    width: 100%;
    height: 100%;
    /* margin: 1em; */
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
}

.gallery img {
    margin: 5px;
    height: 10em;
    width: auto;
}

@media screen and (max-width: 768px) {
    .gallery img {
        height: 5em;
        width: auto;
    }
}