content: 
  class TSizes {
    //padding and margin size
  
    static const double xs = 4.0;
    static const double sm = 8.0;
    static const double md = 16.0;
    static const double lg = 24.0;
    static const double xl = 32.0;
  
    //icon sizes
  
    static const double iconXs = 12.0;
    static const double iconSm = 16.0;
    static const double iconMd = 24.0;
    static const double iconLg = 32.0;
  
    //font sizes
  
    static const double fontSizeSm = 14.0;
    static const double fontSizeMd = 16.0;
    static const double fontSizeLg = 18.0;
  
    //Button sizes
  
    static const double buttonHeight = 19.0;
    static const double buttonRadius = 12.0;
    static const double buttonWidth = 120.0;
  
    //appbar height
  
    static const double appBarHeight = 56.0;
  
    //Image sizes
  
    static const double imageThumbSeize = 80.0;
  
    //Default spacing between sections
  
    static const double defaultSpace = 24.0;
    static const double spaceBtwItems = 16.0;
    static const double spaceBtwSections = 32.0;
  
    //border radius
  
    static const double borderRadiusSm = 4.0;
    static const double borderRadiusMd = 8.0;
    static const double borderRadiusLg = 12.0;
  
    //Divider height
  
    static const double dividerHeight = 1.0;
  
    //Product item dimensions
  
    static const double productImageSize = 120.0;
    static const double productImageRadius = 16.0;
    static const double productImageHeight = 160.0;
  
    //input field
  
    static const double inputFieldRadius = 12.0;
    static const double spaceBtwInputFields = 16.0;
  
    //Card sizes
  
    static const double cardRadiusLg = 16.0;
    static const double cardRadiusMd = 12.0;
    static const double cardRadiusSm = 10.0;
    static const double cardRadiusXs = 6.0;
    static const double cardElevation = 2.0;
  
    //Image carousel height
    static const double imageCarouselHeight = 200.0;
  
    //loading indicator size
    static const double loadingIndicatorHeight = 36.0;
  
    //Grid view spacing
    static const double gridViewSpacing = 16.0;
  
  }