@media screen and (max-width: 480px) {

    main {
        /*padding: 4em 2em 2.5em 2em;*/
        width: 100%;
    }
}

@media screen and (min-width: 1200px) {
    main {
        margin-left: 250px;
        margin-right: 250px;
    }
}

@media screen and (min-width: 1600px) {
    main {
        margin-left: 300px;
        margin-right: 300px;
    }
}