weseek__growi/apps/app/src/components/LoginForm.module.scss

.login-form :global {
  // To adjust the behavior, this problem is not solved.
  // See https://github.com/AaronCCWong/react-card-flip/issues/56
  .react-card-front,
  .react-card-back {
    height: 0% !important;
  }

  .collapse-external-auth {
    overflow: hidden;
  }
}