@media screen
and (min-device-width: 1200px)
and (max-device-width: 1600px)
and (-webkit-min-device-pixel-ratio: 1) {
    .panel-col-thirty {
        width: 30%;
        float: right;
    }
    .panel-col-seventy {
        width: 70%;
        float: left;
    }

    .panel-top, .panel-bottom {
        width: 100%;
        clear: both;
    }

    /* Margins taken from the Panels module plugins */
    .lastUnit .inside {
        margin: 0 0 1em .5em;
    }
    .firstUnit .inside {
        margin: 0 .5em 1em 0;
    }
    .unit .inside {
        margin: 0 .5em 1em .5em;
    }
}