body {
    font-family: sans-serif;
    text-align: justify;
    font-size: 13pt;
}

@media screen and (min-width: 1200px) {
    body {
        margin: 0 20%;
    }
}

@media screen and (max-width: 1200px) {
    body {
        margin: 0 10%;
    }
}

@media screen and (max-width: 600px) {
    body {
        margin: 0 5%;
    }
}