script.Parent.MouseLeave:Connect(function()
TweenService:Create(script.Parent, argument, {ImageColor3 = Color3.fromRGB(138, 138, 138)})
end)
I need help, I don't know what to put for the 2nd argument on this script, as I've forgotten a bit of lua. I'd appreciate it if someone helped me.

2 comments
https://developer.roblox.com/en-us/articles/GUI-Animations
Thank you.