App里面如何正确显示用户头像

<div class="main-meimg"><img src="http://playback-langlive.ufile.ucloud.com.cn/c8f137446774494db18e41839c4a788f.jpg" alt=""></div>

.main-meimg {
    width: 2.08rem;
    margin: 0 auto;
    height: 2.08rem;
    border: 0.06rem solid #B37DFD;
    border-radius: 50%;
    padding: 0.08rem;
    box-shadow: inset 0 0 0.133333rem #B37DFD;
    position: relative;
}
.main-meimg img {
    width: auto;
    height: 100%;
    position: absolute;
    left: -100%;
    top: -100%;
    right: -100%;
    bottom: -100%;
    margin: auto;
    border-radius: 50%;
}