Implement "background" and "font" CSS module styles

They will be initially used in the global theme styles implemented
in GH-53.

Associated epic: GH-51
GH-59

src/styles/theme/colors/background.js

@@ -0,0 +1,27 @@
+/*
+ * Copyright (C) 2018-present Arctic Ice Studio <[email protected]>
+ * Copyright (C) 2018-present Sven Greb <[email protected]>
+ *
+ * Project:    Nord Docs
+ * Repository: https://github.com/arcticicestudio/nord-docs
+ * License:    MIT
+ */
+
+/**
+ * @file Provides theme background colors.
+ * @author Arctic Ice Studio <[email protected]>
+ * @author Sven Greb <[email protected]>
+ * @since 0.2.0
+ */
+
+import nord from "./nord";
+import { MODE_BRIGHT_SNOW_FLURRY, MODE_DARK_NIGHT_FROST } from "../constants";
+
+const base = {
+  [MODE_BRIGHT_SNOW_FLURRY]: "#fff",
+  [MODE_DARK_NIGHT_FROST]: nord.nord0
+};
+
+const background = { base };
+
+export default background;

src/styles/theme/colors/font.js

@@ -0,0 +1,27 @@
+/*
+ * Copyright (C) 2018-present Arctic Ice Studio <[email protected]>
+ * Copyright (C) 2018-present Sven Greb <[email protected]>
+ *
+ * Project:    Nord Docs
+ * Repository: https://github.com/arcticicestudio/nord-docs
+ * License:    MIT
+ */
+
+/**
+ * @file Provides theme font colors.
+ * @author Arctic Ice Studio <[email protected]>
+ * @author Sven Greb <[email protected]>
+ * @since 0.2.0
+ */
+
+import nord from "./nord";
+import { MODE_BRIGHT_SNOW_FLURRY, MODE_DARK_NIGHT_FROST } from "../constants";
+
+const base = {
+  [MODE_BRIGHT_SNOW_FLURRY]: nord.nord3,
+  [MODE_DARK_NIGHT_FROST]: nord.nord6
+};
+
+const font = { base };
+
+export default font;

src/styles/theme/colors/index.js

@@ -14,10 +14,14 @@
  * @since 0.2.0
  */
 
+import background from "./background";
+import font from "./font";
 import nord from "./nord";
 import palettes from "./palettes";
 
 const colors = {
+  background,
+  font,
   ...nord,
   ...palettes
 };