body{
background-color: white;
}

.wrapper{
    display: flex;
}

.quarter_box{
    width: 25%;
    background-color: lightgray;
    margin: 10px;
    padding: 2%;
}


.third_box{
    width: 33.333%;
    background-color: lightblue;
    margin: 10px;
    padding: 2%;
}

.half_box{
    width: 50%;
    background-color: lightpink;
    margin: 10px;
    padding: 2%;
}

.green_third_box{
    width: 33.333%;
    background-color: palegreen;
    margin: 10px;
    padding: 2%;
}

.twothirds_box{
    width: 66.666%;
    background-color: palegreen;
    margin: 10px;
    padding: 2%;
}

@media screen and (max-width:728px) {
    .wrapper{
        flex-direction: column;
    }
    .green_third_box,.half_box,.third_box,.twothirds_box,.quarter_box{
        width: auto;
    }
}