update Code Gen ui (#150)

Signed-off-by: Yue, Wenjiao <wenjiao.yue@intel.com>

CodeGen/ui/svelte/postcss.config.cjs

@@ -0,0 +1,13 @@
+const tailwindcss = require("tailwindcss");
+const autoprefixer = require("autoprefixer");
+
+const config = {
+  plugins: [
+    //Some plugins, like tailwindcss/nesting, need to run before Tailwind,
+    tailwindcss(),
+    //But others, like autoprefixer, need to run after,
+    autoprefixer,
+  ],
+};
+
+module.exports = config;