@media only screen and (max-width: 600px) {
    body {
        width: 600px;
    }
    .banner1 {
        margin: 0 auto;
    }
    .banner1 table {
        width: 100%;
    }
}
@media only screen and (min-width: 768px) {
    body {
        width: 1583px;
    }
    .banner1 {
        margin: 0 auto;
    }
    .banner1 table {
        width: 100%;
    }
}

/* Large devices (laptops/desktops, 992px and up) */
@media only screen and (min-width: 992px) {
    body {
        width: 1583px;
    }
    .banner1 {
        margin: 0 auto;
    }
    .banner1 table {
        width: 100%;
    }
}

/* Extra large devices (large laptops and desktops, 1200px and up) */
@media only screen and (min-width: 1200px) {
    body {
        width: 100%;
    }
    .banner1 {
        margin: 0 auto;
    }
    .banner1 table {
        width: 100%;
    }
}