LayoutConfig constructor
      
      LayoutConfig({ 
    
    
- required MarginSpec leftMarginSpec,
- required MarginSpec topMarginSpec,
- required MarginSpec rightMarginSpec,
- required MarginSpec bottomMarginSpec,
Implementation
LayoutConfig({
  required this.leftMarginSpec,
  required this.topMarginSpec,
  required this.rightMarginSpec,
  required this.bottomMarginSpec,
});