.pedigree{
    width: 1600px;
}

.gen{
    float: left;
    width: 400px;
}

.gen div:nth-child(even){
    background: #eee;
}

.gen div:nth-child(odd){
    background: #fcfcfc;
}

.gen1 div{
    height: 640px;
}

.gen2 div{
    height: 320px;

}

.gen3 div{
    height: 160px;

}

.gen4 div{
    height: 80px;

}

.gen5 div{
    height: 40px;
}

.parent{
    border: 0px;
    width: 292px;
    display: block;
}