body.login_admin {
  background: url('https://crm.upvan.com/media/Sigin-background-image.jpg') no-repeat center center fixed; /* The full image url*/
  -webkit-background-size: cover;
  -moz-background-size: cover;
  -o-background-size: cover;
  background-size: cover;
}
body.customers_login {
  background: url('https://crm.upvan.com/media/Sigin-background-image.jpg') no-repeat center center fixed; /* The full image url*/
  -webkit-background-size: cover;
  -moz-background-size: cover;
  -o-background-size: cover;
  background-size: cover;
}