Microsoft rolls out a new basic theme for Windows 10
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The Windows 10 operating system has a new look, with some people used to using a darker theme making the switch.
With the May 2019 Update, or Windows 10 version 1903, Microsoft redesigned the "basic and light" theme so that apps, elements and other core UI elements are all shaded light, so users can experience a greater distinction between the light and dark themes.
It’s also worth mentioning you can change the theme by heading to Settings > Personalization > Themes and from there select the “Windows Light” theme.