.ad-fullfloat{ width: 100%; height: 100%; background: #fff; position: fixed; color: #fff; z-index: 99999; }
.fullfloat-box{ position: absolute; left: 50%; top:50%; width: 1000px; height: 600px; margin-left: -500px; margin-top: -300px; overflow: hidden; }
/*.fullfloat-box .close-btn{  position: absolute; right: 10px; top:10px; background:url(http://js.self.com.cn/self/adjs/images/close.png) no-repeat; cursor: pointer; width: 50px;height: 20px;}*/

.ad-fullfloat .close-btn{ position: absolute; width: 100%; left:0; text-align: center; bottom:60px; color: #fff; cursor: pointer; }