.thumbnails {
    display: flex;
    margin: 1rem auto 0;
    padding: 0;
    justify-content: center;
}

.thumbnail {
    width: 70px;
    height: 70px;
    overflow: hidden;
    list-style: none;
    margin: 0 0.2rem;
    cursor: pointer;
    opacity: 0.3;
}

.thumbnail.is-active {
    opacity: 1;
}

.thumbnail img {
    width: 100%;
    height: auto;
}