各种尺寸的图片，统一大小展示

<div class="img-box">
	<img src="XXX" />
div>

.img-box {
    position: relative;
}

.img-box:before {
    content: "";
    display: block;
    padding-top: 100%;
}

.img-box img {
    position: absolute;
    top: 0;
    left: 0;
    width: 90% !important;
    height: 90%;
    border-radius: 6px;
    object-fit: cover; // 仿小程序端，mode="aspectFill"
}