.art img {
  object-fit: contain;
  object-position: center;
  background: #000;
  padding: 8px;
}

@media (max-width: 620px) {
  .art {
    min-height: 290px;
    padding: 14px;
  }

  .art img {
    width: min(100%, 260px);
    height: auto;
    padding: 6px;
    border-radius: 18px;
  }
}