drupal/core/modules/openid/openid.css

#edit-openid-identifier {
  background-image: url("login-bg.png");
  background-position: left 50%; /* LTR */
  background-repeat: no-repeat;
  padding-left: 20px; /* LTR */
}

#block-user-login #openid-login-form {
  display: none;
}

#block-user-login .openid-link {
  background-image: url("login-bg.png");
  background-position: left top; /* LTR */
  background-repeat: no-repeat;
  padding: 0 0 0 1.5em; /* LTR */
}