Highlighting active window

In Ubuntu 14 and 16, there is not much to distinguish the active window visually. It can help to set a highly visible shadow around the active window, for instance, red.

  1. Install CompizConfig settings manager.
  2. Under Desktop, select Ubuntu Unity Plugin.
  3. Select the Decorations tab.
  4. Set Active window shadow color to red 255, Green 0, Blue 0, and Opacity 255.