.firstpost_advert_container {
    clear: both;
    display: block;
    float: left;
    margin-bottom: 12px;
    position: relative;
    width: 100%;
    border: 1px solid #E5E6F4;
}

.firstpost_advert {
    with: 100%;
    background: #F1F1FA;
    border: 1px solid #fff;
    min-height: 10px;
    margin: 0;
    padding: 7px;
    text-align: center;
    vertical-align: middle;
}