.gallery {
    list-style: none;
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
}

.gallery__list-item {
    flex-basis: 30%;
    margin: 10px;
}

@media (orientation: portrait) and (max-width: 767px) {
    .gallery__list-item {
        flex-basis: 100%;
    }
}

.gallery__image {
    height: 30vh;
    object-fit: cover;
    object-position: center;
    opacity: 0.8;
    transition: .2s;
}

.gallery__image:hover {
    opacity: 1;
}