Do you want to stack your dock on such an effect? In fact, the lion would have this effect presets，Just do not open，Now let's open it manually：
First, open the "Terminal" (Applications ->Utilities)，Then enter the following command：
defaults write com.apple.dock mouse-over-hilite-stack -bool TRUE;killall Dock
At this time the system may be slightly Caton seconds，And then re-opening the stack，Check it out! Mouse over，Pretty Highlight。
If you want to close，To the input terminal：
defaults delete com.apple.dock mouse-over-hilite-stack;killall Dock
Since finishing aboveHere。
Original article written by LogStudio：R0uter's Blog » How to make the stack display highlight OS X system files?
Reproduced Please keep the source and description link：https://www.logcg.com/archives/129.html
