margin property

double margin

Material 2

Implementation

double get margin {
  if (isXSmallScreen) {
    return 16;
  } else if (isXXSmallScreen) {
    return 32;
  } else if (isSmallScreen) {
    return (screenWidth - 840) / 2;
  } else if (isMediumScreen) {
    return 200;
  }
  return (screenWidth - 1040) / 2;
}