.modal-backdrop {
  position: fixed;
  display: none;
  inset: 0;
  background: var(--color-overlay-backdrop);
  z-index: var(--z-index-modal);
  overflow-y: auto;
  justify-content: center;
  padding: 8px 0;
  animation-name: fadein;
  animation-duration: .2s;
  overscroll-behavior: contain;
  user-select: none;
}

.modal-backdrop:has(> [open]) {
  display: flex;
}

.modal-backdrop > .modal-dialog {
  position: static;
  margin-top: auto;
  margin-bottom: auto;
}