.adsense-sidebar {
    width: 90%;
    max-width: 320px;
    min-height: 90px;
    margin: 16px auto 16px auto;
    padding: 4px 0;
    background: #fff;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.06);
    text-align: center;
}
.adsense-sidebar ins.adsbygoogle {
    display: block;
    margin: 0 auto;
}