*{
    box-sizing: border-box;
}

body{
    background-color: aqua;
}

#padre{
    width: 90%;
    height: 300px;
    margin: 10% auto;
    background-color: blue;
    padding: 16px;
    display: flex;
    
}

#hijo1{
    width: 20%;
    height: 268px;
    background-color: lightyellow;
}

#hijo2{
    width: 20%;
    height: 268px;
    margin: 0px 16px;
    background-color: lightpink;
}

#hijo3{
    width: 20%;
    height: 268px;
    background-color: lightgreen;
}