body { 
    background: #fff url(../images/login/bg.jpg) no-repeat center center fixed; 
    -webkit-background-size: cover;
    -moz-background-size: cover;
    -o-background-size: cover;
    background-size: cover;
}

.panel-default, .panel-primary {
    margin-top: 70px;
}

.form-group.last { margin-bottom: 10px; }