how to chancge the background color of a button when its active?

So i have this script Cause i dont wanna reqeust on this site(cause that illigal lol)

so i tried making a script and searching on rblx wiki but i could not find it can some one help me?

here is my script

script.Parent.MouseButton1Click:Connect(function()
script.Parent.Text = "You Clicked Me"
end)
script.Parent.MouseEnter:Connect(function()
script.Parent.BackgroundColor3 = 149, 149, 149
end)