Merge pull request #2747 from Automattic/spearhead/add/global-styles-css

Spearhead: Add Global Styles CSS variables

spearhead/variables.css

@@ -1,8 +1,8 @@
 :root {
 	/* Globals */
 	/* Font Family */
-	--global--font-primary: 'IBM Plex Mono', sans-serif;
-	--global--font-secondary: 'Libre Franklin', sans-serif;
+	--global--font-primary: var(--font-headings,'IBM Plex Mono', sans-serif);
+	--global--font-secondary: var(--font-base,'Libre Franklin', sans-serif);
 	/* Colors */
 	--global--color-primary: #DB0042;
 	--global--color-primary-hover: #DB0042;