body {
    padding-bottom: 60px;
    background: #eee;
}

div#body {
    background: #fff;
}

div.ad {
    position: relative;
    margin: 10px auto 20px;
}
div.ad.bigblock {
    width: 300px;
}

@media only screen and (min-width: 800px) {
    div.ad.leaderboard {
        width: 970px;
        border: 1px solid black;
    }
	div.side_by_side_ad div.ad {
		float: left;
		margin: 0 20px 20px 0;
	}
}

@media only screen and (max-width: 800px) {

    div#mobile_footer_ad {
        width: 100%;
        /* height: 60px; */
        background: #222;
        position: fixed;
        bottom: 0;
        left: 0;
    }
    div#mobile_footer_ad div.ad {
        margin: 0 auto;
        padding: 5px 0;
        border-bottom: 0;
    }
    div.ad.leaderboard {
        display: none;
    }
}