By default, Start menu, Taskbar and Windows border color will be dark grey. You can change this default color to your desired color.
- Open Settings App.
- Click Personalization.
- Click Colors.
- Choose an accent color or have the option to choose accent color automatically from background image.
- Click Show color on Start, Taskbar and Action Center.
- Choose your desired color.
- You can also make Startmenu or Start screen to look like transparent.