If you are one of the millions still using Windows 8.1 due to hardware constraints or software compatibility, do not despair. A beautiful, dark UI is within reach.
You can manually darken the taskbar and Start screen colors, though this won't affect folders or app backgrounds. dark theme for windows 81
Move your mouse to the bottom right to open the and click Settings . Click Personalize . If you are one of the millions still using Windows 8