div {
    position: relative;
}

.thumbnail-prev {
    display: flex;
    justify-content: center;
    align-items: center;
}

.thumbnail {
    margin-top: 4rem;
    margin-bottom: 3rem;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
}

.img-container {
    display: flex;
    max-width: 80%;
}

.vid-container {
    display: flex;
    justify-content: center;
    align-items: center;
    max-width:100%;
}