<div class="lianxi">
<a><img style="width: 20px; height: 20px;" src="/wp-content/uploads/2020/06/wechat.svg" />
<div>微信号:xxxxxxxxx</div></a></div>



.lianxi div {display:none;}
.lianxi :hover div {
    display: initial;
    position: absolute;
    top: 50px;
    right: 50px;
    border-radius: 5px;
    padding: 8px;
    background: #08213e;
}