more respnsive: header hamburger done, started base

web/themes/custom/materiotheme/materiotheme.theme

@@ -61,6 +61,16 @@ function materiotheme_preprocess_html(&$vars) {
 
   $vars['page']['#attached']['html_head'][] = [$description, 'description'];
 
+  $viewport = array(
+    '#tag' => 'meta',
+    '#attributes' => array(
+      'name' => 'viewport',
+      'content' => 'width=device-width, initial-scale=1, maximum-scale=1',
+    ),
+  );
+  $vars['page']['#attached']['html_head'][] = [$viewport, 'viewport'];
+  // drupal_add_html_head($viewport, 'viewport');
+
   // $gv = [
   //   '#tag' => 'meta',
   //   '#attributes' => [