.container1{
    display: flex;
    border: 2px solid black;
    background-color: blue;
}
.container1 div{
    border: 2px solid black;
    padding: 10px;
    margin: 15px;
    width: 200px;
    background-color: lightblue;
}
*{
    box-sizing: border-box;
}

.container2 div{
    background-color: lightslategrey;
    border: 2px solid black;
    padding: 10px;
    margin: 15px;
    width: 200px;
    background-color: lightblue;
}
.container2{
    display: flex;
    flex-direction: column;
    flex-wrap: wrap;
    background-color: blue;
    height: 600px;
}