<Dark Mode Spreadsheet Palette>
1. Midnight Blue - 
                            
                            #001F3F
                         - A deep, dark blue that provides a calm and professional background.
2. Charcoal Gray - 
                            
                            #2D2D2D
                         - A neutral dark gray that reduces strain on the eyes and complements white text well.
3. Deep Teal - 
                            
                            #007A7C
                         - A rich teal that adds a touch of color while remaining soothing and not overwhelming.
4. Dark Slate - 
                            
                            #3C3F41
                         - A slightly lighter gray that can be used for subtle contrasts within the spreadsheet.
5. Dark Olive Green - 
                            
                            #4A4E2A
                         - An earthy green that evokes a natural feel and is easy to read against white text.

This color palette is designed for a spreadsheet that can be comfortably viewed for extended periods, minimizing eye strain while ensuring that the white text is legible. The selected colors balance between professionalism and aesthetic appeal.

Would you like to see variations of any specific colors, or do you have any additional requirements for the palette?