Light

Light is a new visual style that debuted in Windows 10 build 18282. It makes the taskbar, action centre and start menu white and you can't set colour on them but you can set the title bars to be colourised. It is planned to be included in the final version of Windows 10 19H1.

Gallery
10.0.18282.1000.rs_prerelease.181109-1613|Light theme in Windows 10 build 18282