*{
    box-sizing: border-box;
}

body{
    background-color: aquamarine;
}

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

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

#hijo2{
    width: 100%;
    height: 230px;
    background-color:darkkhaki;
    margin: 0px 10px;
}

#hijo3{
    width: 20%;
    height: 230px;
    background-color:gold;
}