Add custom theme option

postcss.config.js

@@ -1,6 +1,7 @@
-module.exports = {
-  plugins: {
-    tailwindcss: {},
-    autoprefixer: {},
-  },
+import tailwind from 'tailwindcss';
+import autoprefixer from 'autoprefixer';
+import tailwindConfig from './tailwind.config.js';
+
+export default {
+  plugins: [tailwind(tailwindConfig), autoprefixer],
 };