*{
    box-sizing: border-box;
}


body{
    background-color: beige
}

#padre{
    width: 100%;
    height: 250px;
    background-color: darkkhaki;
    display: flex;
    flex-wrap: nowrap;
    padding: 10px;
}

#hijo1{
    width: 20%;
    height: 230px;
    background-color: plum;
}

#hijo2{
    width: 100%;
    height: 230px;
    background-color: papayawhip;
    margin-left: 10px;
    padding: 10px;
}

#nieto{
    width: 100%;
    height: 210px;
    background-color: teal;
}