/* Remove this if you dont want background overlay over the image or adjust per your needs */
body.login_admin:before, body.customers_login:before {
    content: " ";
    background: rgba(31, 31, 31, 0.7);
    min-height: 100%;
    min-width: 100%;
    position: absolute;
}
body.login_admin,body.customers_login {
  background: url('http://pms2.sigmeo.pl/assets/images/sigmeo.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 .login-heading {
  display: none;
}
body.customers_login .navbar {
  display: none;
}
body.customers .navbar {
  background: #000 !important;
}