span.weixin {
    position: relative;
}
 
.weixin img {
    position: absolute;
    right: -28px;
    top: -180px;
    z-index: 99;
    width: 7.5rem;
    height: 7.5rem;
    border: 0.3125rem solid #0085ba;
    border-radius: 0.25rem;
    transform: scale(0);
    opacity: 0;
    transform-origin: top right;
    max-width: none;
}
 
.weixin:hover img {
    transform: scale(1);
    opacity: 1;
}