Change Dock color on left/right site in OS X 10.9 Mavericks New in OS X Mavericks, when using the famous dock on the left or right site:
It has a white background now. It makes it hard to see the icons and the design is awful.

Does anyone know how to change it back to the old black and transparent style?
(in the screenshot on the left side)


  Same Topic available on apple boards:
  https://discussions.apple.com/thread/5469133
You can set hide-mirror to true to remove the blur effect:

defaults write com.apple.dock hide-mirror -bool true;killall Dock


Before: 
 After: 

I don't know how to make the background dark though.