Roblox LOCAL SCRIPT

local player = game.Players.LocalPlayer

game.ReplicatedStorage:WaitForChild("Fade").OnClientEvent:Connect(function(option)
    if option == "fade" then
        script.Parent.Frame.BackgroundTransparency = 0
        player:WaitForChild("PlayerGui"):SetTopbarTransparency(0)
    else
        for i = 1, 10 do
            script.Parent.Frame.BackgroundTransparency = i/10
            if player:WaitForChild("PlayerGui"):GetTopbarTransparency() < 0.5 then
                player.WaitForChild("PlayerGui"):SetTopbarTransparency(i/10)
            end
            wait()
        end
    end
end)