diff --git a/lib/twenty_forty_eight/game/board.ex b/lib/twenty_forty_eight/game/board.ex
index 8515c48..1d95bed 100644
--- a/lib/twenty_forty_eight/game/board.ex
+++ b/lib/twenty_forty_eight/game/board.ex
@@ -1,4 +1,7 @@
 defmodule TwentyFortyEight.Game.Board do
+  @moduledoc """
+  Game board value store and business logic handler.
+  """
   @enforce_keys [:cells, :num_rows, :num_cols]
   defstruct [:cells, :num_rows, :num_cols]
 
diff --git a/lib/twenty_forty_eight/game/engine.ex b/lib/twenty_forty_eight/game/engine.ex
index 15bdef3..0aa5d1f 100644
--- a/lib/twenty_forty_eight/game/engine.ex
+++ b/lib/twenty_forty_eight/game/engine.ex
@@ -1,4 +1,7 @@
 defmodule TwentyFortyEight.Game.Engine do
+  @moduledoc """
+  Mutate game state via input events.
+  """
   alias TwentyFortyEight.Game.Board
 
   @doc """
diff --git a/lib/twenty_forty_eight/game/game.ex b/lib/twenty_forty_eight/game/game.ex
index aee713e..c67f0d1 100644
--- a/lib/twenty_forty_eight/game/game.ex
+++ b/lib/twenty_forty_eight/game/game.ex
@@ -1,4 +1,7 @@
 defmodule TwentyFortyEight.Game.Game do
+  @moduledoc """
+  Persistance layer for storing game state to a database.
+  """
   use Ecto.Schema
   import Ecto.Changeset
 
diff --git a/lib/twenty_forty_eight/game/manager.ex b/lib/twenty_forty_eight/game/manager.ex
index f7771b2..3281961 100644
--- a/lib/twenty_forty_eight/game/manager.ex
+++ b/lib/twenty_forty_eight/game/manager.ex
@@ -1,4 +1,7 @@
 defmodule TwentyFortyEight.Game.Manager do
+  @moduledoc """
+  Store game state and process business logic events.
+  """
   use GenServer, restart: :transient
 
   alias TwentyFortyEight.Game.{Board, Engine, Game}
diff --git a/lib/twenty_forty_eight/mailer.ex b/lib/twenty_forty_eight/mailer.ex
index 136bda4..316a790 100644
--- a/lib/twenty_forty_eight/mailer.ex
+++ b/lib/twenty_forty_eight/mailer.ex
@@ -1,3 +1,4 @@
 defmodule TwentyFortyEight.Mailer do
+  @moduledoc false
   use Swoosh.Mailer, otp_app: :twenty_forty_eight
 end
diff --git a/lib/twenty_forty_eight_web/components/core_components.ex b/lib/twenty_forty_eight_web/components/core_components.ex
index 152fd4f..a47bdc4 100644
--- a/lib/twenty_forty_eight_web/components/core_components.ex
+++ b/lib/twenty_forty_eight_web/components/core_components.ex
@@ -230,7 +230,7 @@ defmodule TwentyFortyEightWeb.CoreComponents do
     <button
       type={@type}
       class={[
-        "phx-submit-loading:opacity-75 rounded-lg bg-zinc-900 hover:bg-zinc-700 py-2 px-3",
+        "phx-submit-loading:opacity-75 rounded-lg bg-rose-500 hover:bg-rose-600 py-2 px-3",
         "text-sm font-semibold leading-6 text-white active:text-white/80",
         @class
       ]}
diff --git a/lib/twenty_forty_eight_web/components/layouts.ex b/lib/twenty_forty_eight_web/components/layouts.ex
index 19a4900..9402894 100644
--- a/lib/twenty_forty_eight_web/components/layouts.ex
+++ b/lib/twenty_forty_eight_web/components/layouts.ex
@@ -1,4 +1,5 @@
 defmodule TwentyFortyEightWeb.Layouts do
+  @moduledoc false
   use TwentyFortyEightWeb, :html
 
   embed_templates "layouts/*"
diff --git a/lib/twenty_forty_eight_web/telemetry.ex b/lib/twenty_forty_eight_web/telemetry.ex
index 1953c43..71ad422 100644
--- a/lib/twenty_forty_eight_web/telemetry.ex
+++ b/lib/twenty_forty_eight_web/telemetry.ex
@@ -1,4 +1,5 @@
 defmodule TwentyFortyEightWeb.Telemetry do
+  @moduledoc false
   use Supervisor
   import Telemetry.Metrics