a.jijin-link { margin: 10px auto; display: block; width: 540px;} .jijin-box { width: 540px; height: auto; margin: 0 auto; position: relative;}.jijin-box .jijin-img{width:100%;}.jijin-thumb { position: absolute; left: 0; top: 0; bottom:0; right:0; background: url(//tu.duoduocdn.com/uploads/news/day_170418/20170418143736.jpg);}.jijin-thumb {background-size: cover;} (注：同样，这里使用了图像替换，实际应为正确图片链接)
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