.corner-ad {
    position: fixed;
    right: max(12px, calc((100vw - 480px) / 2 + 12px));
    bottom: 80px;
    z-index: 30;
    width: 84px;
    height: 100px;
    border-radius: 7px;
    overflow: hidden;
    box-shadow: 0 2px 12px #0003;
}
.corner-ad .ad-track img {
    display: block;
    width: 100%;
    height: 100%;
    object-fit: cover;
}