Update

frontend/tailwind.config.cjs

@@ -1,10 +1,17 @@
-/** @type {import('tailwindcss').Config} */
 const withMT = require("@material-tailwind/react/utils/withMT");
+const colors = require("tailwindcss/colors");
 
 module.exports = withMT({
   content: ["./index.html", "./src/**/*.{js,ts,jsx,tsx}"],
   theme: {
-    extend: {},
+    extend: {
+      colors: {
+        sky: colors.sky,
+        green: colors.green,
+        slate: colors.slate,
+        orange: colors.orange, // falls du z. B. text-orange-300 brauchst
+      },
+    },
   },
   plugins: [],
-});
+});