.flex-container {
    border: 2px solid black;
    display: flex;
    flex-direction: row;
    height: 300px;
    width: 500px;
    justify-content: flex-end;
    align-items: center;
}

.flex-item {
    border: 1px solid red;
    width: 80px;
    height: 80px;
}