.box {
    /* width: 150px;
    height: 150px; */
    font-size: 8em;
    text-align: center;
    border-radius: 15px;
}

#box1 {
    background-color: red;
}

#box2 {
    background-color: yellow;
}

#box3 {
    background-color: green;
}

#box4 {
    background-color: blue;
}

/*column, column-reverse, row-reverse */
#container {
    border: 10px solid black;
    height: 500px;
    display: flex;
    flex-direction: row;
    /* align-items: stretch; */
    justify-content: space-around;

}