@type t() :: %LINE.Bot.MessagingApi.Model.FlexBox{
  action: LINE.Bot.Model.Action.t() | nil,
  alignItems: String.t() | nil,
  background: LINE.Bot.Model.FlexBoxBackground.t() | nil,
  backgroundColor: String.t() | nil,
  borderColor: String.t() | nil,
  borderWidth: String.t() | nil,
  contents: [LINE.Bot.Model.FlexComponent.t()],
  cornerRadius: String.t() | nil,
  flex: integer() | nil,
  height: String.t() | nil,
  justifyContent: String.t() | nil,
  layout: String.t(),
  margin: String.t() | nil,
  maxHeight: String.t() | nil,
  maxWidth: String.t() | nil,
  offsetBottom: String.t() | nil,
  offsetEnd: String.t() | nil,
  offsetStart: String.t() | nil,
  offsetTop: String.t() | nil,
  paddingAll: String.t() | nil,
  paddingBottom: String.t() | nil,
  paddingEnd: String.t() | nil,
  paddingStart: String.t() | nil,
  paddingTop: String.t() | nil,
  position: String.t() | nil,
  spacing: String.t() | nil,
  type: String.t(),
  width: String.t() | nil
}