@media (min-width: 761px) {
  .login-body .login-shell { position: relative; }
  /* Keep the decorative rule out of the two-column login grid. */
  .login-body .login-shell::before {
    position: absolute;
    inset: 0 0 auto;
    z-index: 2;
    pointer-events: none;
  }
}