add configs

postcss.config.mjs

@@ -2,6 +2,29 @@
 const config = {
   plugins: {
     tailwindcss: {},
+
+    autoprefixer: {},
+    "postcss-flexbugs-fixes": {
+      "postcss-preset-env": {
+        autoprefixer: {
+          flexbox: "no-2009",
+        },
+        stage: 3,
+        features: {
+          "custom-properties": false,
+        },
+      },
+
+      "@fullhuman/postcss-purgecss": {
+        content: [
+          "./pages/**/*.{js,jsx,ts,tsx}",
+          "./components/**/*.{js,jsx,ts,tsx}",
+        ],
+        defaultExtractor: (content) => content.match(/[\w-/:]+(?<!:)/g) || [],
+        safelist: ["html", "body"],
+      },
+    },
+    cssnano: {},
   },
 };