Microsoft has rolled out a new theme for Office that’s easier on your eyes and also makes buttons and other menu items in the Ribbon stand out. If you thought the Dark Gray theme wasn’t dark enough, here’s how to enable the higher contrast, Black theme.

The Black theme is available now for Office 2016 and Office 365 users. The other Office themes–Colorful, Dark Gray, and Classic White–are still there.
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https://www.laptopmag.com/articles/microsoft-office-black-theme