*{
    box-sizing: border-box;
}
 
body{
    margin: 0;
    background-color: rgb(179, 231, 247);
    line-height: 1,4;
}
.container{
    max-width: 960px;
    margin: 0 auto;
    border: 2px solid purple;
 
}
.row{
    display: flex;
    flex-wrap: wrap;
 
}
.flex-item{
    height: 150px;
    flex-basis: 320px;
   
}
.prvi{
    background-color: rgb(165, 192, 241);
    flex-grow: 1;
    flex-shrink: 10;
    flex-basis: 300px;
    font-size: 30px;
}
.drugi{
    background-color: rgb(211, 200, 252);
    flex-grow: 1;
    flex-shrink: 7;
    font-size: 30px;
}
.treci{
    background-color: rgb(248, 121, 220);
    flex-grow: 1;
    flex-shrink: 5;
    font-size: 30px;
    
}