diff --git a/assets/css/_game_info.scss b/assets/css/_game_info.scss
index 5cb2e20..2996350 100644
--- a/assets/css/_game_info.scss
+++ b/assets/css/_game_info.scss
@@ -3,7 +3,7 @@
 
   .offline,
   .viewing {
-    &:before {
+    &::before {
       border-radius: 50%;
       content: "";
       display: inline-block;
@@ -16,14 +16,14 @@
   .offline {
     opacity: 0.4;
 
-    &:before {
-      background-color: #cc3333;
+    &::before {
+      background-color: $offline-opponent-color;
     }
   }
 
   .viewing {
-    &:before {
-      background-color: #66cc33;
+    &::before {
+      background-color: $viewing-opponent-color;
     }
   }
 }
diff --git a/assets/css/_variables.scss b/assets/css/_variables.scss
index 9d0ed7f..0089c9f 100644
--- a/assets/css/_variables.scss
+++ b/assets/css/_variables.scss
@@ -24,6 +24,9 @@ $your-turn-background-color: rgba($white, 0.1);
 
 $game-state-background-color: rgba(darken($black-square-color, 10%), 0.9);
 
+$offline-opponent-color: #cc3333;
+$viewing-opponent-color: #66cc33;
+
 $square-outline-color: darken($black-square-color, 20%);
 $selected-outline-color: lighten($selected-square-color, 20%);
 $available-outline-color: rgba(lighten($available-square-color, 20%), 0.5);
diff --git a/lib/chess/emails.ex b/lib/chess/emails.ex
index 717a159..8a927f4 100644
--- a/lib/chess/emails.ex
+++ b/lib/chess/emails.ex
@@ -6,6 +6,7 @@ defmodule Chess.Emails do
 
   alias Chess.Repo
   alias Chess.Store.User
+  alias ChessWeb.Router.Helpers
 
   def new_game_email(conn, game) do
     new_email()
@@ -15,7 +16,7 @@ defmodule Chess.Emails do
       "[64squares] #{game.user.name} has invited you to play a game of chess."
     )
     |> text_body("""
-      Game link: #{ChessWeb.Router.Helpers.game_url(conn, :show, game)}
+      Game link: #{Helpers.game_url(conn, :show, game)}
     """)
   end
 
@@ -30,7 +31,7 @@ defmodule Chess.Emails do
       "[64squares] #{user.name} has moved."
     )
     |> text_body("""
-      Game link: #{ChessWeb.Router.Helpers.game_url(socket, :show, game)}
+      Game link: #{Helpers.game_url(socket, :show, game)}
     """)
   end
 end
diff --git a/lib/chess/mailer.ex b/lib/chess/mailer.ex
index ad7f21b..34b7a58 100644
--- a/lib/chess/mailer.ex
+++ b/lib/chess/mailer.ex
@@ -1,3 +1,5 @@
 defmodule Chess.Mailer do
+  @moduledoc false
+
   use Bamboo.Mailer, otp_app: :chess
 end