Color Palette:

1. Color Name: Midnight Blue
   Hex Code: 
                            
                            #191970
                        
   Description: Represents the background color of the E-R model diagram.

2. Color Name: Electric Blue
   Hex Code: 
                            
                            #7DF9FF
                        
   Description: Used for highlighting entities in the E-R model diagram.

3. Color Name: Royal Purple
   Hex Code: 
                            
                            #6A0DAD
                        
   Description: Represents relationships in the E-R model diagram.

4. Color Name: Silver
   Hex Code: 
                            
                            #C0C0C0
                        
   Description: Used for text and labels in the E-R model diagram.

5. Color Name: Coral
   Hex Code: 
                            
                            #FF7F50
                        
   Description: Represents attributes in the E-R model diagram.

6. Color Name: Emerald Green
   Hex Code: 
                            
                            #50C878
                        
   Description: Used for annotations and notes in the E-R model diagram.