#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%;
}   
    .comment_unit {
        border-top: thin dashed #FFC964;
        border-bottom: thin dashed #FFC964;
        border-collapse: collapse;
    }
    .comment_unit1 {
        border-top: thin dashed #FFC964;
        border-bottom: thin dashed #FFC964;
        border-collapse: collapse;
        background-color: #FFDFA4; 
	}
    .photo_column {
        width: 180px;
        padding-top: 2%;
        padding-bottom: 2%;
        text-align: center;
        vertical-align: top;
    }
    .comment_column {
        font-size: 130%;
        color: black;
        line-height: 115%;
        padding: 2% 0% 2% 2%;
        vertical-align: top;
    }
    h1 {
/* Add padding-right, to centre text on the page rather than inside page_content. (14-1-17.) */
    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%;
    }
}