first

wp-content/themes/simple-theme/template-parts/404.php

@@ -0,0 +1,15 @@
+<?php
+
+if (!defined('ABSPATH')) {
+  exit; // Exit if accessed directly.
+}
+?>
+
+<main class="site-main" role="main">
+    <header class="page-header">
+      <h1 class="entry-title"><?php esc_html_e('The page can&rsquo;t be found.', gV('slug')); ?></h1>
+    </header>
+  <div class="page-content">
+    <p><?php esc_html_e('It looks like nothing was found at this location.', gV('slug')); ?></p>
+  </div>
+</main>