body.auth-login {background: #fff url("../images/bg1.jpg") no-repeat 0 0; background-size:100% auto;}
body.auth-register {background: #fff url("../images/bg2.jpg") no-repeat 0 0; background-size:100% auto;}


@media screen and (max-width: 767px) {
  body.auth-login {
    background-image:none;
  }
}