div.italy{
    position: relative;
    border: 1px solid #333;
    width: 18ex; 
    height:12ex;
}

div.italy div{
    position: absolute;
    width: 6ex;
    height: 12ex;
}

div.italy div:first-child{
    top:0;
    left: 0;
    background: #297f3e;
}


div.italy div:nth-child(2){
    top: 0;
    left:6ex;
    background: #ffffff;
}

div.italy div:last-child{
    top: 0;
    left:12ex;
    background: #d63b3b;
}