.shade{width: 200px; height: 200px; position: absolute; background: #000; opacity: 0.4; top: 0;
left: 0; display: none;}
.big{width: 400px; height: 400px; position: absolute; top: 100px; overflow: hidden; left: 500px; display: none;}
.big img{width: 800px; height: 800px; position: absolute; display: none;}