css如何实现图片大于div时的居中显示（代码实例）

<div class="face-img-contain" id="face-img-back">
 </div>

.face-img-contain{
    width:348px;
    height:436px;
    margin:0 auto;
    margin-top: 14px;
    position: relative;
    background-image: url(../images/face-img/test-22.png);
    background-repeat: no-repeat;
    background-position: center;
    background-size: cover;
    display: flex;
    justify-content: center;
    align-items: center;
    border: 1px solid gainsboro;
}

若是后台返回的地址，别忘了拼接方法正确
$("#face-img-back").css("background-image","url("+faceImg+")");

<div class="face-img-contain-new-new">
    <img src="../images/face-img/test-22.png" alt="" class="face-img-defined1" id="face-img-photo">
</div>

.face-img-contain-new-new{
    width:348px;
    height:436px;
    margin:0 auto;
    margin-top: 14px;
    position: relative;
    display: flex;
    justify-content: center;
    align-items: center;
    overflow: hidden;
    border: 1px solid gainsboro;
}
.face-img-defined1{
    width:100%;
    height:100%;
    object-fit:cover;
}