Microsoft Office includes black and dark gray themes. The system-wide dark mode on Windows 10, Windows 11, and Mac will now affect Office apps, but you can also separately choose a dark theme for Office apps like Microsoft Word, Excel, Outlook, and PowerPoint on Windows.
How to Enable Dark Mode in Microsoft Office
Microsoft Office includes black and dark gray themes. The system-wide dark mode on Windows 10, Windows 11, and Mac will now affect Office apps, but you can also separately choose a dark theme for Office apps like Microsoft Word, Excel, Outlook, and PowerPoint on Windows.