- Right click desktop, Personalize.
- Scroll down and choose the High Contrast Black Theme.
- Click the Color section at bottom of the Personalization screen.
- Leave this window open.
- Right click the desktop, Personalize.
- Click on the Windows theme under Windows Default Themes.
- You can close this window and return to the original Personalize window that you left open earlier.
- Hit Save Changes.
- Your Taskbar is now completely transparent.
You can mess with other settings now to return some portions of the High Contrast theme to something more to your liking, don't forget to save this Theme under a new custom name!