.adblock {
    background-color:#eeeeee;
    margin-top:2em;
    margin-bottom:2em;
    width:100%;
}

.adblock .last {
    margin-right:0;
}

.adblock .ad150 {
    border:1px solid blue;
    width:20%;
    display:inline;
}

#adblock {
    background-color:#eeeeee;
    margin-top:2em;
    margin-bottom:2em;
    width:100%;
}

#adblock .ad150 {
    border:1px solid blue;
    width:20%;
    display:inline;
}