The new Windows 10 v1903 update includes a new Light desktop theme option

https://www.howtogeek.com/417976/how-to-enable-windows-10s-new-light-theme/

Windows 10’s May 2019 Update includes a new light theme and a brighter default desktop background to go with it. Here’s how to enable the shiny new theme and get a lighter looking desktop.   If you previously used Windows 10’s default desktop background, it’s been replaced with the shiny new one. But, if you’ve switched to a custom desktop wallpaper, the upgrade won’t change your default background.  To use Windows 10’s shiny new desktop background, head to Settings > Personalization > Background