.card
{
    width: 10cm;
    height: 10cm;
    border: solid 1px black;
    box-shadow: 5px 5px 0px gray;
    float: left;
    margin: 2mm;
    position: relative;
    border-radius: 100%;
    text-align: center;
}
.card > img {
    width: calc(100% - 8mm - 8mm);
    position: absolute;
    top: 0;
    left: 0;
    margin: 8mm;
}