How do i apply a color script from a value?

Sorry for the title, i can't really explain it from a title.

What i'm trying to say is that im trying to make:

mouse.KeyDown:connect(function(keys)
	if keys =="f" then
	if mouse.Target ~= nil then
		if mouse.Target.Material==Enum.Material.Pebble then
			local SelectBox = Instance.new("SelectionBox", mouse.Target)
			
			SelectBox.Adornee = mouse.Target	
			SelectBox.Color3 = Color3.fromRGB(script.Parent.Color.Value)
			print"done"
			
			
		end end
	end
end)

The Color Value is a color3 value, but when i use the script the selectionbox appears to be black?

First of all, Mouse.KeyDown is deprecated. While it would be a good idea to use a new method, I don't think is your main problem here. In line 8, try just typing:

SelectBox.Color3 = script.Parent.Color.Value

Hope this helps! If it does, please accept my answer!