there is not enough space for all the children. By default, this is a
        "Window too small" message.
    :param align: `VerticalAlign` value.
    :param width: When given, use this width instead of looking at the children.
    :param height: When given, use this height instead of looking at the children.
    :param z_index: (int or None) When specified, this can be used to bring
        element in front of floating elements.  `None` means: inherit from parent.
    :param style: A style string.
    :param modal: ``True`` or ``False``.
    :param key_bindings: ``None`` or a :class:`.KeyBindings` object.

    :param padding: (`Dimension` or int), size to be used for the padding.
    :param padding_char: Character to be used for filling in the padding.
    :param padding_style: Style to applied to the padding.
    Nr