body { 
  background: url(../Content/img/fondo_login.jpg) no-repeat center center fixed; 
  -webkit-background-size: cover;
  -moz-background-size: cover;
  -o-background-size: cover;
  background-size: cover;
}

.card {
opacity: 0.9;
margin-top:30px;
}
/*.form-group.last { margin-botto*/