.wp-adutility-ad {
    margin: auto;
    overflow: hidden;
}

.wp-adutility-ad-leaderboard {
    text-align: center;
    min-height: 50px;
}

@media (min-width: 728px) {
    .wp-adutility-ad-leaderboard {
        min-height: 90px;
    }
}