.container {
    background-color: lightpink;
    display: flex;
    height: 600px;
    width: 300px;
    flex-wrap: wrap;
    align-items: flex-start;
    /* align-content: flex-start; */
    flex-direction: column;
}

.item {
    width: 120px;
    height: 100px;
    background-color: aquamarine;
    padding: 10px;
    margin: 5px;
    text-align: center;
    flex-basis: 30%;
}

.item1 {
    align-self: flex-end;
    /* flex-grow: 1;
    flex-shrink: 0; */

    flex: 1 0 30%;
}