.ad-leader-top {
    width: 728px;
    height: 90px;
    /* 990 - 728 -250 */
    margin-right: 12px;
    margin-bottom: 2px;
    float: left;
}

.ad-house-top {
    width: 250px;
    height: 90px;
    margin-bottom: 2px;
    float: left;
}

.ad-med-rec-top {
    width: 300px;
    height: 250px;
    float: right;
    margin-right: 25px;
}