GUI button does not change color when clicked

[sand flame]

did you check the naming is correct?

Like the path to the button is correct?

Also @summer wind . += doesnt work this lua.

local var = 1

script.Parent.MouseButton1Click:Connect(function(clicked)
    local player = game.Players.LocalPlayer
    var = var + 1
    
    if var % 2 == 0 then 
        game.Lighting.Bloom.Enabled = false
    else
        game.Lighting.Bloom.Enabled = true
    end
    
    if game.Lighting.Bloom.Enabled then
        player.PlayerGui.mainmenu.settings.bloomonoff.bloombutton.ImageColor3 = Color3.fromRGB(0, 255, 0)
    else
        player.PlayerGui.mainmenu.settings.bloomonoff.bloombutton.ImageColor3 = Color3.fromRGB(255, 0, 0)
    end
end)

here is fixed code

[sand flame]

is the path to the button correct?