*{
    box-sizing: border-box;
}
body{
    margin: 350px;
    background-color: lemonchiffon;
    line-height: 1,4;
}

.container{
    max-width: 960px;
    margin: 0 auto;
    outline: 6px dotted crimson;
}

.row{
    display: flex;
    flex-wrap: wrap;

}

.flex-item{
    height: 180px;
    flex-basis: 320px;
}
.two{
    background-color: darkgreen;
    flex-grow: 1;
    flex-shrink: 10;


}
.five{
    background-color: chocolate;
    flex-grow: 1;
    flex-shrink: 7;


}
.six{
    background-color: midnightblue;
    flex-grow: 1;
    flex-shrink: 5;
}