.bigimg{width:600px;position: fixed;left: 0;top: 0; right: 0;bottom: 0;margin:auto;display: none;z-index:9999;border: 10px solid #fff;}
    .mask{position: fixed;left: 0;top: 0; right: 0;bottom: 0;background-color: #000;opacity:0.5;filter: Alpha(opacity=50);z-index: 999;transition:all 1s;display: none}
    .mask:hover{cursor:zoom-out}
    .mask>img{position: fixed;right:10px;top: 10px;width: 60px;}
    .mask>img:hover{cursor:pointer}