.row {
    width: 50em;
    border: 2px solid;
    display: flex;
    flex-direction: row;
    flex-wrap: nowrap;
    align-content: center;
    justify-content: center;
    align-items: center;
}

.row div {
    display: flex;
    flex-direction: row;
    flex-wrap: nowrap;
    align-content: center;
    justify-content: center;
    align-items: center;
    width: 33%;
}