body { 
  background: url("../../Content/Images/header_two.jpg") no-repeat center center fixed; 
 /**/
  -webkit-background-size: cover;
  -moz-background-size: cover;
  -o-background-size: cover;
  background-size: cover;
}

.panel-default {
opacity: 0.9;
margin-top:30px; 
}
.form-group.last { margin-bottom:0px; }
        .middle-box {
            padding: 20px; overflow:hidden;
        }