.dialog {width: 290px; border: 7px solid #4C77B6; background: #fff; padding: 12px 15px; z-index: 1000; position: fixed; top: 0px; margin: 200px 0 0 -145px; left: 50%;}
.auth_bg {height: 100%; width: 100%; background: url(auth_bg.png); position: fixed; z-index: 999; top:0px; left:0px;}