Dark Theme For Windows 8.1 ((better))

The Windows 8.1 taskbar can be darkened natively, but the Start Screen is a problem. If you use the Start Screen (the full-screen tiles), it supports a dark background natively.

For application-specific needs, check the internal settings of your most-used programs. Many legacy apps from the Windows 8.1 era, such as VLC Media Player or Steam, have their own "Skin" or "Dark Mode" settings that operate independently of the Windows system theme. Why Switch to Dark Mode? dark theme for windows 8.1