Let's talk about this other problem first:
That shortcut property has several default values. When you place it where you have you are wiping out the values of several of the previous background* properties that you have there.
Put your shortcut property BEFORE all of your other background* properties and then this won't happen.
Now, onto the problem with your input property. You are missing a
". Everything after that missing
" is being ignored.
Can you spot that now?