message: adjust z-index of popper
diff: @@ -69,6 +69,7 @@ type PopperProps = {
  popperOptions?: PopperOptions;
  popperRef?: React.Ref<PopperJS>;
  reference: Reference | (() => Reference);
  + zIndex?: number;
  };
  const DEFAULT_POPPER_OPTIONS: PopperOptions = {};
  @@ -85,6 +86,7 @@ const Popper: React.FC<PopperProps> = ({
  closeOnOutsideClick,
  onRequestClose,
  popperRef: popperRefIn,
  + zIndex = 9999,
  }) => {
  const controlled = typeof open === 'boolean';
  const openProp = controlled ? open : true;
  @@ -194,7 +196,7 @@ const Popper: React.FC<PopperProps> = ({
  return isOpen ? (
  <Portal container={container}>
  - <div ref={nodeRefCallback} className={className}>
  + <div ref={nodeRefCallback} className={className} style={{ zIndex }}>
  {children}
  </div>
  </Portal>
  