div.container div.content div.content-art {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
    flex-direction: row;
    justify-content: center;
    align-items: flex-start;
    align-content: flex-start;
    margin: 0 auto;
    max-width: 800px;
}

div.container div.content div.content-art div.content-art-piece {
    height: 250px;
    max-width: 500px;
    /*flex-grow: 1;*/
}

div.container div.content div.content-art div.content-art-piece a img {
    width: 100%;
    height: 100%;
    border: 1px solid black;
}

div.container div.content div.content-art div.content-art-piece a:hover img {
    opacity: 70%;
}