@media screen and (min-width: 1080px) {
    body {
        margin: 20px;
    }
}

@media screen and (min-width: 768px) and (max-width: 1080px) {
    body {
        margin: 10px;
    }
}

@media screen and (min-width: 320px) and (max-width: 786px) {
    body {
        margin: 5px;
    }
}