How to change the color of the taskbar

The color of the taskbar can be either black or light grey.  This color is determined by the Windows theme setting.  The Windows theme controls the color of the Windows interface, which includes the taskbar, Start menu, Action Center, touch keyboard, etc.  To change the Windows theme:

Open Settings , then select Personalization .  Select Colors and under "Choose your color", select Custom from the dropdown options.

Set "Choose your default Windows mode" to Light to give the Windows interface (including the taskbar) a light grey background.  Select Dark to give the interface (including the taskbar) a black background.

Note: These theme settings were added in Windows 10, version 1607.  If you don't see these options in Settings, make sure you've installed the latest Windows Updates.