.t_bg { position:fixed; top:0; left:0; background:url(../images/30.png); width:100%; height:100%; z-index:9999999; }.t_bg .tishi { width:400px; height:162px; background:#fff;               padding:0;            -moz-box-shadow: 0px 0px 20px #777;    -webkit-box-shadow: 0px 0px 20px #777;    box-shadow: 0px 0px 20px #777;    border-radius:4px;    overflow:hidden;    position:absolute; top:50%; left:50%; margin:-81px 0 0 -200px;    }.t_bg .tishi h2 { position:relative; height:40px; background:#f9f9f9; line-height:40px; padding:0 13px; font-size:14px; font-family:'宋体'; color:#333; border-bottom:solid 1px #ddd;}.t_bg .tishi h2 .close { position:absolute; top:13px; right:13px; width:14px; height:14px; background:url(../images/close.gif) no-repeat; cursor:pointer; }.t_bg .tishi p { padding:26px 0 14px; text-align:center; color:#f00; font-size:14px; font-family:Microsoft Yahei; }.t_bg .tishi .queding { display:block; width:120px; height:36px; line-height:36px; text-align:center; cursor:pointer; margin:0 auto; background:#f1f1f1; border:solid 1px #ccc; border-radius:2px;}.t_bg .tishi .queding:hover { background:#f9f9f9; border-color:#ddd; text-decoration:none;}