body {
    background-color: white;
}

.wrapper {
    display: flex;
}

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

.third_box {
    width: 33.33%;
    background-color: lightblue;
    margin: 10px;
    padding: 2%;
}

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

.greenthird_box {
    width: 33.33%;
    background-color: palegreen;
    margin: 10px;
    padding: 2%;
}

.twothird_box {
    width: 66.66%;
    background-color: palegreen;
    margin: 10px;
    padding: 2%;
}

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