update,

laravel-simple-tryout/php74-httpd/example-app/webpack.mix.js

@@ -0,0 +1,17 @@
+const mix = require('laravel-mix');
+
+/*
+ |--------------------------------------------------------------------------
+ | Mix Asset Management
+ |--------------------------------------------------------------------------
+ |
+ | Mix provides a clean, fluent API for defining some Webpack build steps
+ | for your Laravel applications. By default, we are compiling the CSS
+ | file for the application as well as bundling up all the JS files.
+ |
+ */
+
+mix.js('resources/js/app.js', 'public/js')
+    .postCss('resources/css/material-dashboard.css', 'public/css', [
+        //
+    ]);