fix dropdown issue, add autoprefix for scss

vite.build.js

@@ -1,25 +1,38 @@
 import { build } from "vite";
+import postcssPresetEnv from "postcss-preset-env";
 
 const libraries = [
   {
-    entry: './lib/ui.js',
-    name: 'lib-ui'
-  },
-  {
-    entry: './lib/utility.js',
-    name: 'lib-utility'
-  }
-]
-
-libraries.forEach(async lib => {
-  await build({
+    clearScreen: false,
+    css: {
+      postcss: {
+        plugins: [postcssPresetEnv()]
+      }
+    },
     build: {
       lib: {
-        ...lib,
+        entry: './lib/ui.js',
+        name: 'lib-ui',
         formats: ['umd'],
         fileName: (_format, name) => `${name}.min.js`
       },
-      sourcemap: true
+      sourcemap: true,
+      emptyOutDir: false
     }
-  })
-})
+  },
+  {
+    clearScreen: false,
+    build: {
+      lib: {
+        entry: './lib/utility.js',
+        name: 'lib-utility',
+        formats: ['umd'],
+        fileName: (_format, name) => `${name}.min.js`
+      },
+      sourcemap: true,
+      emptyOutDir: false
+    }
+  }
+]
+
+libraries.forEach(async b => await build(b))