fix css:build

Author: CybotTM

internal/web/tailwind.css

@@ -1,5 +1,2 @@
 /* This file is an entrypoint for the TailwindCSS compiler */
-
-@tailwind base;
-@tailwind components;
-@tailwind utilities;
+@import "tailwindcss";

postcss.config.js renamed to postcss.config.mjs

@@ -1,7 +1,7 @@
-module.exports = {
+export default {
   plugins: {
     autoprefixer: {},
     cssnano: {},
-    "@tailwindcss/postcss": {}
+    "@tailwindcss/postcss": {},
   }
-};
+}