css 图片上下左右居中且不变形

<div class="imgBox">
          <img src="/Upload/Template/797e4e0d-8b1e-46a0-aefc-24ae30502e72.png" alt="" title="">
 </div>

css:

.imgBox {
    width: 164px;
    display: block;
    height: 164px;
    text-align: center;
    border: 1px solid #bfbfbf;
}
.imgBox img {
    max-width: 100%;
    max-height: 100%;
    display: inline-block;
    vertical-align: middle;
}