#page_content {
    margin-left: 20%;
    margin-right: 20%;
}
.ad1 {
    margin-left: 20%;
    margin-right: 20%;
/* Width declaration. Solely because required for AdSense responsive ad. (29-12-16.) */
    width: 60%;
    margin-bottom: 1%;
}   
    h1 {
    padding-right: 0%;
}
@media screen and (max-width: 800px) {
    /* Styles for ad1. */
    .ad1 {
        margin-left: 5%;
        margin-right: 5%;
    /* Width declaration. Solely because required for AdSense responsive ad. (29-12-16.) */
        width: 90%;
        margin-bottom: 1%;
    }
    /* Styles for page_content */
    #page_content {
        margin-left: 5%;
        margin-right: 5%;
    }
}
@media screen and (min-width: 1624px) {
    /* Styles for ad1. */
    .ad1 {
        margin-left: 23%;
        margin-right: 23%;
    /* Width declaration. Solely because required for AdSense responsive ad. (29-12-16.) */
        width: 54%;
        margin-bottom: 1%;
    }
    /* Styles for page_content */
    #page_content {
        margin-left: 23%;
        margin-right: 23%;
    }
}