.dailog {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 9999;
    background-color: rgba(0,0,0,0.6);
    filter: progid:DXImageTransform.Microsoft.gradient(startColorstr=#4c000000,endColorstr=#4c000000);
    text-align: center;
    display: none;
}
.dai-video {
    display: none;
    top: 50%;
    left: 50%;
    margin-top:-225px;
    margin-left:-420px;
    position: absolute;
    width: 800px;
}
.dai-video a {
    display: block;
    margin-bottom: -50px;
    width: 30px;
    height: 30px;
    float: right;
    padding: 10px;
    color: #fff;
    position: relative;
    z-index: 99;
    margin-right: 10px;
}