#page_content {
    margin-left: 0%;
    margin-right: 0%;
}
.ad {
    margin-left: 22%;
    margin-right: 18%;
/* Width declaration. Solely because required for AdSense responsive ad. (29-12-16.) */
    width: 60%;
    margin-top: 1%;
    margin-bottom: 1%;
}
.margins {
    margin-left: 22%;
    margin-right: 18%;
}

@media screen and (max-width: 800px) {
    /* Styles for ad. */
    .ad {
        margin-left: 7%;
        margin-right: 3%;
        /* Width declaration. Solely because required for AdSense responsive ad. (29-12-16.) */
        width: 90%;
        margin-top: 1%;
        margin-bottom: 1%;
    }

    .margins {
        margin-left: 7%;
        margin-right: 3%;
    }
}

@media screen and (min-width: 1624px) {
    /* Styles for ad. */
    .ad {
        margin-left: 25%;
        margin-right: 22%;
        /* Width declaration. Solely because required for AdSense responsive ad. (29-12-16.) */
        width: 53%;
        margin-top: 1%;
        margin-bottom: 1%;
    }
    .margins {
        margin-left: 25%;
        margin-right: 22%;
    }
}