.erweima_item{
    position: relative;
    text-align: center;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
}
.erweima_bg_box{
    padding: 5px;
    background-color: #FFF;
    border-radius: 3px;
    position: absolute;
    top: 45px;
    left: -35px;
    box-shadow: 0 0 4px rgba(33,33,33,0.3);
    transition: all 0.3s;
    -webkit-transition: all 0.3s;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-20px);
    -webkit-transform: translateY(-20px);
}
.wx_erweima{
    width: 100px;
    height: 100px;
}
.erweima_item:hover .erweima_bg_box{
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
    -webkit-transform: translateY(0);
}
.erweima_bg_box:after {
    content: "";
    width: 0;
    height: 0;
    border: 8px solid #fff;
    border-top-color: transparent;
    border-left-color: transparent;
    border-right-color: transparent;
    position: absolute;
    right: 46px;
    top: -126px;
    bottom: 0;
    margin: auto;
}