refactor: css cleanup and style tweaks

postcss.config.mjs

@@ -0,0 +1,11 @@
+import postcssImport from 'postcss-import';
+import postcssNesting from 'tailwindcss/nesting/index.js';
+import tailwindcss from 'tailwindcss';
+
+export default {
+    plugins: {
+        'postcss-import': postcssImport,          // to combine multiple css files
+        'tailwindcss/nesting': postcssNesting,
+        tailwindcss: tailwindcss,
+    }
+};