CentOS 7.1 How to change panel background

[Globe Trotter <itsme_410@xxxxxxxxx>]

Hi,
I just installed CentOS and have been trying to change the desktop panel background (in gnome classic) to black. How do I do this? Holding the alt button while right-clicking on the mouse does not seem to do anything. 

I do not have anything installed (other than what came with the LiveCD).
Many thanks!

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