css一行文字垂直居中，两行文字超出显示省略号，且鼠标经过，显示全部文字

span{
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    text-overflow: ellipsis;
}
div{
    font-size: 18px;
    height: 46px;
    line-height: 23px;
    display: flex;
    align-items: center;
    justify-content: center;
}