CSS hat einen übergeordneten Selektor

/* If no image, add radius to the top left and right corners. */
.card:not(:has(img)) .card__content {
    border-top-left-radius: 12px;
    border-top-right-radius: 12px;
}

.card img {
    border-top-left-radius: 12px;
    border-top-right-radius: 12px;
}

.card__content {
    border-bottom-left-radius: 12px;
    border-bottom-right-radius: 12px;
}
Thoughtful Turkey